What's the coolest/most interesting thing you've found in your truck

[DBK81]

A post further down where someone found cash in thier tire made me think about the interesting things I've found in vehicles, so what's the most interesting things you guys have found in your trucks?

Mine would have to be a rusty old 9/16th wrench that had fallen down into the front wheel well. Im sure we have all had those "I wonder where that tool went moments" haha