Over the years, I've found various things in the washer or dryer. Things such as money (both bills and coins), small plastic toys, play-doh, gum (melted onto a pocket by the dryer), counting bears, pens, nuts and bolts.
A couple of weeks ago, I was taking towels out of the washer and transferring them to the dryer when I found this at the back of the washer.
A sweet potato! A nice, clean sweet potato!
A little while later, Samuel confessed (when he found out it'd not broken the machine) to having put it in there "to see what would happen". Boys!