Fisher's riddle.

Jimmy Snyder

This is not a logic puzzle, but just an old riddle I happen to like, called the Fisher's riddle.

The ones we catch we throw away.
The ones we don't catch we keep.

What are they catching and not catching?

BicycleTree

Answer:Mistakes

Jimmy Snyder

Good BicycleTree. I like the answer, fleas, a little better because it's a little hard to imagine a mistake that a fisher could make and then throw away.