One of my favorite "oops" in a champions game was a fight that the bad guy tricked the local official hero group (us) and a powered vigilante group into having.
In the fight, one of our members went for their 10 1/2 dice high-power attack on one of the vigilantes, knowing that the target was tough to take down. Based on the evidence we'd had of them, average damage from such an attack would put the the character within a few points of running out of stun damage, enoguh to make them back off, or reconsider the fight.
Well, that was the plan.
out of a possible 63 points, the attack inflicted 59!!!! That's seven 6s, two 5s, a 4, and a 6 on the half-die, for 18 Body, PLUS double digit stun negatives getting applied. OUCH... alas poor vigilante, and any chance of the two groups working together.