Like so many before me, I would have to say Fallout 3: GotY Edition.
For the PS3.
I mean, this game has the freaking WORKS when it comes to glitches:
- Screen turning black, but the action is still going on.
- Game freezing completely up during loading screens.
- Game freezing up during VATS (although 2/3 of the time, it continues after a minute or two)
- Game slowing down to a frame rate of 10 fps.
- Textures Loading too slowly.
- Getting stuck.
- Glitches that causes NPCs not to act as they should.
- Stuff getting stuck in other stuff and acting all loopy.
- Slowdown in the sound effects.
- Etc.
Most of the time, I just play the game till it freezes up (2 - 3 hours), turn off the console and continue when I stop being frustrated about how messed up the whole thing is.