I was playing Prototype.
I was using the claws power and decided to use the groundspike attack on a tank. Apparently I had positioned it just right so that the tank flew up into the air.
Get this: A helicopter was hovering above the tank, shooting at me. When the tank hit the helicopter, it exploded. I then jumped into the air, ran up the side of the falling helicopter, switched to the blade in mid air, did a backflip and cut another tank in half.
It was beautiful.
However, I would like to recognize Frictional games for using this perfectly. Most of the things they didn't script, they just let the monsters roam free in a linear path, but not in a linear way. This led to some horrific moments that I shall treasure for quite some time.
I have also caused a zombieman to die all 3 deaths in the game: killed, gibbed, and crushed. I was standing in an open doorway and there was a zombieman in front of 2 explosive barrels, alligned horizontal to each other but vertically to him. I shot him with a shotgun, except with one side of the shells' spread. The zombie started his normal death animation, but within the last few frames, the second barrel exploded. He then stood back up and did his gibbing animation. However, the force of the barrel propelled him into the doorway and the door crushed his gibbed corpse. Note that this was all within the course of about 5 seconds, so I was truly impressed.
Another thing, now that I think of it: Quake 4 for the 360. I didn't care a whole lot for quake 4, but it really hated me. There were bizzare glitches all the time: sometimes rockets would randomly fly at me from the walls with no enemies/turrets to produce them. Sometimes I would simply fall through the floor and die. Once I just fell over dead for absolutely no reason whatsoever.