I've been doing little boys' laundry for many years now. It never ceases to amaze me what they find precious enough to carry around in their pants pockets. I've found the usual things like: change, Legos, and the occasional hot wheels car. If I'm lucky, I'll find the green crayon before it gets to the dryer.
More unusual things that I find with regularity: large amounts of pea gravel (this is also likely to be found in sneakers on any given day. Wouldn't that be uncomfortable in there?) school papers with bad grades all wadded up, notes from teachers from last week and pencil erasers. The creepiest thing I found was a cricket. (poor thing didn't make it) today's load of boy pants yielded: peanuts in the shell (2), pea gravel (2 pieces) and some (2) wonky plastic things I've never seen before but I suspect belong at school. Of course, there's the prerequisite eraser.
At least the load was well balanced.