In 1993, Neville Longbottom added too many rat spleens and too much leech juice into his Shrinking Solution, making it posionous. Hermione Granger helped Neville fix the potion before Professor Snape had a chance to test it on Neville's toad, Trevor.
- Harry Potter and the Prisoner of Azkaban (First appearance)
- Harry Potter and the Prisoner of Azkaban (video game) (GBA version only)
- Harry Potter and the Half-Blood Prince (video game)
- The Road to Hogwarts Sweepstakes
- Pottermore(For Swelling solutions)