Oldest/weirdest thing you've found while cleaning your lab?

I'm doing a deep clean/organize of my lab. It's not uncommon to find things like 15 year old boxes pipette tips and the sort. But today I found someones DISSERTATION FROM 1994. Even worse, it was on top of a box of cuvettes, which had turned completely yellow, despite no light being able reach them for 30+ years. So yeah they're old.

What have you found?