Pitting Cherries
Paper clips make useful cherry pitters. Simply unfold a paper clip at its center, and depending on the size of the cherry, insert either the large or small end of the clip through the top of the stemmed cherry. Loosen the pit, and pull it out. If you want to de-pit cherries but leave their stems intact, just insert the clip from the bottom.
I've never tried it but it looks like it could just work.