Jinxed

Jinxed is a Fallout, Fallout 2 and Fallout Tactics trait.

Fallout and Fallout 2
All misses have 50% chance to be "upgraded" to a critical miss. This applies to every single entity in the game.

Fallout Tactics
Presumably the same as in Fallout and Fallout 2, however the chance seems to be significantly lower.