Hmm, I'm pretty nerdy, take your pick:
-Played Magic the Gathering as far as nationals.
-Played Warhammer since the 90's own 20000+ points divided on different armies (most painted).
-Warlock tanked Twin Emperors in WoW.
-Collect modeltrains and build my own traincar models in brass by soldering them together.
-I go trainspotting sometimes and know alot about (mainly Swedish) trains, I am a big train nerd.
-Finished nr4 in a Roller Coaster Tycoon tournament with around 100 people competing.
-Was a big Roller Coaster nerd for awhile.
-It is not weird for me to drink behind the computer alone on a friday night.
-Both my desktop and server runs linux right now.
-I own and used to play lots of pen and paper rpgs.
-I collect NES-games
-I have seen 150+ animes series (including girlanimes, love romance, school life, etc.).
-I can beat Mega Man 2 in ~45min without dying (not on emu ofcourse).
-Played in the school team chess national tournament and won (didn't sit on first table though
).
Other things includes playing other TCGs like Starwars, Doomtrooper, WoW, GI Joe. Playing boardgames like Heroquest, Mutant Chronicles, Robowars, etc. Testing lots of other games like Pirates of the Spanish Main, Mechwarrior table top game, etc. I can't remember everything. :>