Caturday Surprise is one of the bottles in the episode "The Duke." Finn and Jake were seen throwing bottles outside of Princess Bubblegum's castle. When thrown, it explodes and multicolored spectral cats run out in all directions. It is one of the few explosive weapons that appear in the series.
- The name may be a reference to "Caturday," a long-standing Internet meme where people are urged to post pictures of cats every Saturday. Caturday originated on 4chan's /b/ in the mid-2000s.