Obnoxious (but harmless) glitches and bugs

[ScroogeMcDuck]

First time I played HL2 when I first got to Eli's lab all Alyx would say was:
"Gordon... Gordon Gordon... Gordon? Gordon Gordon! Gordon Gordon." truly annoying but has not happened again.

 

[Pandaman1911]

In vanilla Fallout 3, the environment used to completely freak out on me- half the landscape was torn away and stretched infinitely into the sky, like looking through a kaleidoscope from hell. If you managed to go inside a building and then leave, or if you just saved right there and loaded, it fixed, but it scared the shit out of me when it first happened.