A Nut

I seem to have randomly found a human testicle on the floor of UT3. In all my years playing I don't think I have ever seen one outside of wizmode.

Unrelated: Do Belts of levitation ever generate randomly? I have never seen one outside of the sumo challenge.

So far as I know, the only belt of levitation belongs to the sumo and the only other way to get one is with a wish.
Also yeah nuts are very rare and useless random items. Unless you're starving, I guess.