You know you have been playing Tremulous too long when you:
-Wonder wtf is happening when you can't zap anyone with your adv mara, only to realize that were actually a normal mara.

-Play a long game on alien team, join humans next round, and don't recognize the dragoon around the corner as a threat until it chomps your head off.
-Spec someone and try to use the medkit when they have low hp.
-Walk into a real life courtyard and look up for jetcampers
-Think you are a dretch when you are actually a goon, and look-bite at humans instead of chomping them. (this only happens when i'm REALLY tired)
there are more, but they all run along the same lines as the above