You know you've been playing Fallout New Vegas too long when you go to the fridge and skip over the Sarsparilla, knowing full well that it won't quench your thirst.
A friend of mine, a respectable university lecturer, was walking through the carpark on the way home and no doubt looking forward to some WoW PvP. She was talking to another friend on her mobile, loudly (as you tend to on mobiles), and blurted out something to the effect of "I can't wait to get home and kill some people!", no doubt to the shock of any onlooker who wasn't aware of the context.