Funny glitches you've seen in games.

[Bowsling]

in the star wars lego DS version for the IV-VI series, on the the last level of Episode six as Han I went straight through the wall of a hut. The door was only big enough for an ewok to fit through, and the glitch was only one way, so I had to reload.
Exactly how a mousetrap works!

 

[SS-18 ICBM]

Being able to snipe at a taunting enemy through the closed door in Stage 1 of an Xbox 360 TF2 Dustbowl game.

 

[mythmonster2]

Dwarves do not recognize they are on fire. Dwarf Fortress. That is all.