I would have to say my tardis lunch box. I got it when I was visiting my boyfriend and we went to London. I saw a toy store called Hemleys(sp?) and they had an entire section of doctor who stuff. I could have bought a sonic screwdriver but I thought how may times will you see a tardis lunch box.
Mine's not so much a tangible object, but its level of nerd-dom is still pretty impressive. I actually have mp3's of Tom Felton aka Draco Malfoy singing on my iPod. I found his youtube account with his homemade music videos on it and immediately downloaded them.
The part that's most amusing to me, though, is that his username is Feltbeats. I actually listed that as the artist name on the mp3 tracks. XD
definitely my over 500 Pokemon cards.
What can I say? I was an obsessed fourth grader.
But if you mean something I currently look at , probably my photocopied music collection.
Each time I get A new piece of music, I have it photocopied, hole-punched, laminated and put into a book based on language, beginning letter, then personal preference.