I have some carbon fiber rope used by a space elevator startup I kickstarted, prototype devices in the development of the Kinect or 360 Camera (mounted in a Tupperware box with the camera poking through a carved out hole, no less), a Benham's Wheel and Euler's disk, and lots of Halo ephemera collected over the years (like an extremely rare Halo-3 branded gum handed out at PAX early in Bungie's life), a Dragon Illusion by James Dean, and Xbox 360 processor chip, a copy of and a lot of knick nacks with personal stories. :)

Then people started gifting me things like a cherished slide rules and the like. I love my wunderkammer!

I totally know what you mean. I have a couple of boxes of stuff like this, where everything has a meaning. I try to cycle my shelf with the random things.

(I thought I was the only person who did this :) )