I was playing battletech. I was beginning my turn and I started looking for BS instead of gunnery skill.
Playing CoD modern warfare 2. Started yelling Dakka! Dakka! Dakka! when I used the M240. This one is great. I started hearing ppl online saying what the hell.
I can speak fluent Space Ork when playing D&D.
When you watch a chick flick with your girlfriend and wish a Genestealer would come out and rip off Edwards head so the gay twilight movie would end.

this is my favorite moment.
When you hear a beat up pick up truck coming and you start looking for Orks.
When you really think the red ones go faster.
When you sit down and figure you have trained more people to play 40k then the amount of years you have been playing. what i'm only upto 14 years and have trained 17 people?
when you day dream about being a Dreadnought.
when you spend more time doing something for 40k over watching TV.
When you try to explain something using 40k terms to a non-40k player.
when you wish your vehicle had a deff rolla.
when you want to rein act the ride of the Valkyrie's scene from Apocalypse Now, with Valkyrie Assault Carriers and use Orks for the VC.
When you tell people a combat shotgun has a strength of 3 or strength of 4 with man-stopper rounds.
when you tell people that your looking for the chain sword instead of the chain saw.