... when you look at game screenshots you try to close the scrolls by clicking the bottom corner button or hover your mouse over the units to see their status.
(this one's for real, it happens to me and from what I've read on some threads, to others too)

...when you watch a battle scene in a historical movie you leave in disgust after 5 minutes mumbling things like "I would've done better" or "stupid AI".

...when you watch a battle scene in a historical movie for more than 5 minutes, everyone else leaves annoyed by your constant mumbling.

...you don't go shopping for new clothes, you go for upgrading your armour - and become disoriented when you can't find the master armourer.

...when you ask for a few days off from work, your boss asks "What's up, the patch is out ?". You also might plan your holidays around the release dates.

...you can't play any other strategy game anymore except for TW
(this one's not funny, it's just the truth)

...whenever you need to take a boat trip, you become worried about pirates

...you had a bad fight/argument with your father, and just miss the M1TW ability to assasinate your own faction leader to force succesion.