Well.. I'm a geek, I think, so here's a few of mine..
* when you call the apple that you are about to eat 'Mac'.
* when you can programmatically think out the process for how a machine/appliance works.
* when you can see how they do special effects in a movie and plan to see how you could do it in a Java Applet / Flash.
* when you start dreaming about a Starcraft 2 battle and it feels real.
* when you go to a pcf meet and only know the people by their pcf names.
* when you think of doing something relaxing you think of spamming pcf threads (not that I spam at all.. lol).
* when you get an XBOX controller for your PC just to play Prince of Persia and Assasins Creed.
* when using your mouse to navigate through your pc takes longer then you using your keyboard.
* when you want to write so many more geeky things and know that you'll probably take up the whole page.