God I have no idea where to begin.
First I would have to say in Oblivion, during the Arena fight with the Argonians, one of them punched me, sent me flying straight up, and I slammed into the Arenas invisible roof, and died.
In Saints Row 2 I was driving, and I fell through the ground. Forever.
GTA4 I bailed out of my car and slammed Nicos head into a concrete roadblock, taking all my health and armour.
Finally, in Fallout 3, I sniped a raider from a good ways away and she fell over dead, all of her comrads already bloodily massacered and some masticated(its a word look it up). I walked over to loot her body and her arm glitches and hits my guy in the chest with the forces of a Mini-nuke apparently, because it sent me straight into a building and killed me. I had to kill all the Raiders again. I avoided that one though. After I killed her, I mean.