My funniest video game quote is probably one of those 'you had to be there' ones. In WoW, I was part of a 10-man strict raiding guild, and Lich King was still reasonably new. We were working our way through Icecrown Citadel and were engaging Thorim.
In that fight, your group splits into 2 teams. One of them holds the arena floor against things that jump down, the other team runs 'the gauntlet', a hallway with assorted mobs and other dangers to get actually TO the boss, tag him, and bring him down to the arena floor. I was on the gauntlet team, as per usual; as a hunter I have pretty damn good burst damage which is what you want there.
The twist is that there's a second sort-of boss (but not really because you don't get to kill her) with Thorim for the first minute or so after the fight has been started. Normal procedure is to wait for her to leave, tag him, and kill him. Hard mode is engaged when you tag him before she's gone, which causes her to join in the fight adding lots of random damage to the team.
We did not intend, that time, to engage hard mode. But our gauntlet team was damn good.
The fight is going right along, when suddenly over ventrilo is heard, maybe a tenth of a second before Thorim roars and jumps down to the arena "Oh SHIT Sif's still up!" "WHAT?!" (from the raid leader) and then pandemonium. We tried, amid the panic and fall-out-of-our-chairs laughing, and darn near beat the fight. We spent the next 10 or 15 minutes cracking up over it, then rezzed, rebuffed, and took Thorim out.