I think I managed to make just about all the standard GM mistakes over the years...
One that I specifically remember... from High School... one player was the 'I kick down the door and rush in screaming!' type... and I had this room, with no door, that had a large glistening gem sitting right in the center of the floor. It was a trap... he rushed in... the ceiling came smashing down... he died.
Then the argument started... it wasn't fair... he should have had a chance to dodge the ceiling... whatever, I was stubborn about it and kept him dead... but decided I'd give him a chance spirit-jump into some nearby critter and rolled on a quick random chart I made... and put him into a dog.
So he was a dog until they could get him somewhere and have his spirit put back into body. (the dog turned out to be quite useful and the player made the most of it... but he was still kind of cranky).
It's embarrassing to even tell that story... and know I've got a shedload of them waiting in the wings.

Back in the day, we were egging on a very egomaniac player who had an 18/00 fighter, to do all kinds of dangerous things.  Apparently this egomaniac player thought his 18/00 fighter with plate armor made him invincible.  (The DM allowed the fighter to have plate armor at the beginning of the game).  After a short while, this 18/00 fighter ending up dying from too many stupid mistakes and the DM just happening to roll some powerful monsters from a random table.

After his 18/00 fighter died, this egomaniac player punched the DM in the face over it.  After that, he got pissed at the other players for "egging" him on to do so many dangerous things, that he tried to punching one of the players in the face.  So we all ended up ganging up on this egomaniac player, and physically threw him out the front door and onto the front lawn on his ass.

Wow, you guys are a bunch of assholes!

I was at a convention with a bunch of friends several years ago and the bunch wanted to do the whole con together so we signed up for games only if all six of us could get in together.  

On Saturday afternoon, the only fully open game as this dude's playtest of his new sci-fi game.   We said WTF why not and jumped in.   It was atrocious, a textbook of bad game design by someone who had only ever played AD&D and Champions and didn't really know that RPGs design had advanced from 1983.   This was 2003 or so.  More importantly, the dude was 100% sure that his game was unbroken and utterly perfect and because he was an engineer in real life, the game math was also utterly perfect.

So I proceded to demolish his system.  The most casual read showed me that min-maxing would be hysterically simple with his point-buy so I created the "FahJa" after the creepy Dutch swinger dude in Austin Powers 3.   He was uber-rich with no skills and had to be contained in power armor because he had viral airborne venereal disease, but fortunately the power armor was anatomically correct.   More importantly, I bought up a giant robot and filled it to the brim with goodies.

The other players were shocked.  I had fucked his system like a Tijuana whore and it just got worse and worse in the gameplay of his demo.  I egged on the rest of the group and we set about tearing apart the "nice parts" of his setting (Crystal Gardens of the Imperial Empress, etc) and stomping on his canon NPCs to the point he kept writing down notes because now they were dead and he said couldn't exist for future games.

Once we learned that he literally would cut out aspects of his setting based on what we did in a convention one shot demo, it just got really bad.  I led the charge to squash any NPC he had built (which takes about an hour of chargen).

We were merciless.  I've done a lot of demos and lots of playtesting of homebrews, but that dude's insistence of his RPG perfection just set off my shiny red button that day.

And yeah, I'd do it again.

I've been a dick a bunch, especially when I was a teenager playing with my nutjob friends. The two worst incidents:

Back when I was playing with the guy who tried to stab me & the rest of them, I used to have an exacto knife most of the time. When someone died, I'd snap my hand out, grab the character sheet out of their hands / off the table, and slice it in half with the exacto knife while shouting "You're fucking dead! Rez this motherfucker!" I had it down through practice so that I could do it in a single swift motion while cackling. Occasionally I'd throw the pieces back at them.

The second one is the worse of the two, and it's that I was in a group where one PC raped another PC (worse yet, the player playing the rapist was a dude, and the player of the victim was a woman who may or may not have had a crush on him until that point). I pretty much kept my mouth shut and averted my eyes (I wasn't DMing this game either, thankfully). She quit the group basically at the end of the session. Not my proudest moment.

Most of the rest of my dick stuff is lightened by being funny in some way, but those were not good. Thankfully they were both a long time ago.

Quote from: Soylent Green;410786Before I started Gming, I was a  "But that's what my guy would do!" kind of player.

Oh yes, I've done a bit of this in the past too.

Those guys that didn't let Sasha Grey play D&D with them in high school were probably dicks.

Speaking of high school. A friend of mine was running Al Qadim at one point. He wasn't very experienced with GMing but I was excited about finally getting to play instead of GM for a change. Well, it didn't turn out very well when I began to argue with him about the very premise of the adventure. I think he was using a module and at one point we were supposed to travel by land along a coast line. I was whining (I admit it, I was whining) about why we couldn't take a boat instead. I just wouldn't shut up about it. Let's just say that the game ended suddenly.

I...I don't think I was ever a real dick when taking part an in RPG game.  I've been a dick plenty of other times, but I don't remember anything about RPGs.  Honestly.  :idunno:

I've always been tagged as the level-headed sane guy, even in my broader group of friends.

Granted, being too nice as a GM lead to its own share of problems, even if we did have a bunch of fun to make up for it.

My dickishness has not seeped into my gaming (yet),at least not overtly. Perhaps my gaming groups have just kept quiet about it?

:hmm:Not sure this qualifies... I tend to beat a dead horse (unless the GM shuts me down) thereby obfuscating/taking time from the otherwise smooth flow of play (my characters just like to be thorough )!

I once witnessed a game at a local store that caused me to walk over, take the DM's giant soda, dump it all over his books, lap and campaign notes, then inform him that he was banned from the hobby on pain of curb-stomping.

Quote from: Shazbot79;410883I once witnessed a game at a local store that caused me to walk over, take the DM's giant soda, dump it all over his books, lap and campaign notes, then inform him that he was banned from the hobby on pain of curb-stomping.

That was you??

Man, now my copy of Exalted is all orangey :/

I like to think I haven't been a rude or inconsiderate that much, but one occasion leaps immediately to mind. I was a player in a dark sun campaign (I think it was dark sun anyways), and my cousin and his girlfriend were the other two players. We'll say the GM's name was Fred.

We played friday nights. I am not much of a drinker at all, but I was probably 19 or 20 and me and my cousin spent the whole afternoon drinking in his living room, completely forgetting about the game. We even invited a few people over. Basically we blew off the session to get wasted.

Around 7 PM there is a loud knock at the door. It's fred and my cousin's girlfriend. He basically convinced us to go to his house for the game session.

I think the people hanging out at my cousins (who weren't gamers) thought Fred was out of his mind; he kind of showed up like an FBI agent or something.

Quote from: Shazbot79;410883I once witnessed a game at a local store that caused me to walk over, take the DM's giant soda, dump it all over his books, lap and campaign notes, then inform him that he was banned from the hobby on pain of curb-stomping.

*Rolls to disbelieve*

Nope, I don't believe you.

Dick move #1:
When in the military, my weekends would involve a night out in the town on friday, and some gaming on Saturday, another night out in the town in the evening, heavy carousing on both occasions. We had a AD&D2e game running by a close friend of mine, who stepped in to GMing, because I could not during that time. I REGULARLY fell asleep. It was a bit boring (our first encounter with 2e Forgotten Realms-Style), but it was of the most impolite and inconsiderate things I did as a player and friend.

Dick move #2:
When I was 14, I got invited to an group of seven or eight people playing Runequest (ages 16-21). There was a weird group dynamic going on, with one player being a little bit of a grumpy know-it-all. The other players would write little notes to each other mocking him, his grouchiness, character and even his looks. That lead to several instances of notes being exchanged that ended up in giggles, only the grumpy guy grew grumpier and grumpier. I participated in note writing and felt accepted by mocking someone else.
Some years later I met the "grumpy" guy again, and we became good aquaintances. The game itself was a bore, so I never played with the RQ GM again. All in all rather sad and cruel instead of spectacular.

Quote from: Settembrini;410936Dick move #1:
When in the military, my weekends would involve a night out in the town on friday, and some gaming on Saturday, another night out in the town in the evening, heavy carousing on both occasions. We had a AD&D2e game running by a close friend of mine, who stepped in to GMing, because I could not during that time. I REGULARLY fell asleep. It was a bit boring (our first encounter with 2e Forgotten Realms-Style), but it was of the most impolite and inconsiderate things I did as a player and friend.

I used to be a bartender; in those days I was often guilty of the nodding off during a Sunday game session myself. I tended to get very fuzzy during long d20 style combats, too, which made it even worse.

Quote from: Cole;410910That was you??

Man, now my copy of Exalted is all orangey :/

If it's any consolation, I got 86'd from that store for a month after that stunt.