Photo by Emily Ho.
Emily Ho from food blog The Kitchn points out that that a chopstick makes a useful stand-in cherry-pitting tool in a pinch:
To pit cherries with a chopstick, just place the chopstick on the stem-end of the cherry, push it through, and voilà – out pops the pit.
It's not a completely mess-proof solution, but it's certainly better than using your fingers or risking injury with a knife.
No Cherry Pitter? Use a Chopstick [the kitchn]