THEMANWHOIS said:
you know you play too much guitar hero/rock band if when you hear a song you immediately think of the buttons you would need to push to play it.
I'm afraid I already made that one, Chief.
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You know you've been playing too much Mario Kart when you think standing on your gokart and throwing turtles and banana peels at things is a good way to knock other cars off the road.
You know you've been playing too much Xbox360 when you call Microsoft for the fiftieth time to get it replaced. (Hyperbole, but it happens to me frequently. This was a cheap one, I apologise.)
You know you've been playing too much Oni when you grossly overdose on adrenaline to get the upper hand in fighting. Then again, you'd know you were playing too much Oni when you think a little adrenaline can heal bullet wounds and burns.
You know you've been playing too much Crackdown when you finish the game and you find all the entertainment (if any, at this point) is by making things blow up, and you find it boring.
You know you've been playing too much Gears of War when you give yourself a papercut and your vision starts glowing red.
You know you've been playing too much Left 4 Dead when you see someone with a broken ankle and you kneel next to them and try to beckon them up.
You'd also know if you've been playing too much Left 4 Dead when you refer to medical attention as "healing up" which, in a real life situation, would sound out of place.