i've encountered lots of glitches throughout my videogame experiences. the scariest/funiest one i have ever encountered was when i killed an enemy ai so many times that when he finally killed me he it looked like he was teabagging me. i was laughing hysterically but it was kinda scary at the same time
there are lots in cod 5 zombies. on the first map there is one where u go in a wall or something and cant get hit. my friend told me about one on the new map recently where if u get past lvl 25 fairly with no glitching they dont come in the house or attack u. i have never tried these but i heared them alot so i guess their legit.
Probably in Half-Life when a head-crabbed scientist started twitching on the floor. Goood times Also...darn I forgot. I had it when I opened this thread but now I've forgotten :P