The ability to sense things in games, simply because of predictable, long-standing game cliches.
My gaming sense tells me that this innocuous red barrel will explode if thrown.
My gaming sense tells me that this grave will have valuable items in it if I dig it up.
My gaming sense tells me that I'll have to fight a boss in this unexpectedly cavernous room.
The only games console with a melting point below room temperature
person 1: My Xbox 360 melted yesterday
person 2: Was it in a room?
person 1: Yes
person 2: That'll be why then
The amount of time after the last message sent in a facebook/MSN chat conversation before it's OK to log out without saying goodbye/g2g etc. It varies from person to person but usually ranges between 5-20 minutes.
Person 1: It's been 10 minutes since the last message I sent to Bob. You think that's enough chat cooldown?
Person 2: It's borderline...but Bob's a dick, so just log out.