I have a very neurotic 9 year old. I would say he even borders on OCD. 2 years ago we wnt camping and nearby the pool he found a very nice pair of swimming goggles. I told him we could not keep them as they belong to someone else and they would probbaly be back for them. Looking up at me contemplatively he said with a really gross face:

"Yeah! And who knows how many eyes have been in them???!"

Too funny!