I have looked around and not seen one yet (apologies if I have missed it), but the "you know you've played too much X when.." threads usually go down well so I thought I'd make one... I'll start with two of mine out of many, You know you've played too much 40k when this is your ring tone... ...And this is your alarm in the morning. Nothing like blood and slaughter to start the morning...
When you have a room full of shelves full of game books from every version of 40k. (Rogue trader-6th, all the RPG books to date, and Inquisitor ) In addition to almost 40k minis from way too many armies. (including Titans.) Add to that every 40k computer game ever made.... Yea.. I just figured out I may be a bit obsessed with the game.
When you play the Noble Dwarf path on Dragon Age: Origins, but roleplay it as Gotrek Gurnisson. Not something usually recommended but it was interesting to see the results which came of a belligerent slayer's mentality.
Ah yes, that would be my thread... Hold on a sec so that I may find it... *EDIT* Ok, found it... http://forum.eternalcrusade.com/threads/signs-that-you-play-too-much-of-40k.1355/page-18#post-54808
Ah, missed it. I thought I saw it but couldn't find it; I was looking in order of name from 'Y', for "you know..." I shall move my post ~THREAD AWAITING EXTERMINATES~