You look for the medi and armoury in all other games.
You see red and blue dots in front of your eyes after playing aliens too long (Few times

)
Try to luci jump in all other games. (Sometimes this works, often not.)
You find yourself constantly being slaughtered in fps because when covering your angles, you don't aim at any humans, because "obviously" their on your team.
You dream about improving your pounce.
When you are about to die, you hope the spawn queue isn't filled up.
You expect people in other games to be cool, nice, talkative players. (Try going into a random CSS server and starting up a conversation with someone.)
I think we all know those we can't think of right now. We've all played wayyy to much, and will keep playing.
<3 Tremulous
<3 All you fools who keep on truckin