In March 1995, Harry Potter deliberately spilled his armadillo bile at the end of Potions class so he could eavesdrop on a conversation between Severus Snape and Igor Karkaroff about the Dark mark while he cleaned it up.
- Harry Potter and the Goblet of Fire (First appearance)
- Harry Potter and the Half-Blood Prince (video game)
- The Road to Hogwarts Sweepstakes
- Harry Potter: Hogwarts Mystery (mentioned only)