A genuine puzzle:

For Christmas, my brother gave my mother a jigsaw puzzle comprised of old family photos. She loved it, but had just one tiny, tiny problem putting it together: the puzzle was missing one piece. Finally, she took it back apart without finding said piece, and passed the puzzle over to me.

I, in turn, had just one tiny, tiny problem putting it together: the puzzle now has one extra piece.

This is more puzzling than the jigsaw puzzle itself.