A Bad Prank

Pranks are fun little things friends can do to friends and family. Papyrus knew this. Sans pranked him a lot, sometimes switching things in the kitchen, or placing every chair upside down. Small, fun pranks. While annoying, they never caused any harm.

One day, when Undyne came over, she suggests a spur of the moment prank, knowing full well Sans is claustrophobic.

Papyrus realizes Undyne is a bad friend, and Sans has a bad time.

(Undertale belongs to Toby Fox, the cover art is mine.)