The next class of the day was the one that Henry disliked the most. Potions class was such a challenge. The final result always ended with the potion blowing up in his face, literally! However, Potions class with Oreo was even more chaotic! Oreo kept trying to take a swim in his cauldron, which was not good, because the potion being brewed was the Forgetfulness Potion!
After that was Defense Against the Dark Arts. This course was the second favorite of Henry's, only second to Care of Magical Creatures. That day was the Duelling lesson. Henry set Oreo on his desk, hoping that the furry little mischief maker would stay out of trouble. His opponent was Ellie Snow, a Gryffindor who was very good at Duelling. Henry ducked and dodged Ellie's spell, and cast the Tickling Charm in her direction. However, Ellie dodged the blast of light and it hit Oreo! Oreo rolled over onto his back, silently laughing, obviously under the effects of the Tickling Charm.
Once Oreo was back to normal and Ellie won, he went to Ancient Runes, where Henry thought that Oreo could do no more trouble. Well, Henry was never more wrong. The professor brought in some ancient manuscripts and artifacts that were very fragile. Oreo was put into Henry's pocket of his robe. While Henry worked with his partner, Celes Diggory, to translate the runes, Oreo jumped out and onto a piece of very fragile ancient parchment with Elder Futhark runes inscribed onto it. The parchment got torn by Oreo, earning Henry a detention cleaning up Flobberworm mucus in the Potions classroom. Henry was starting to think that Oreo was too much to handle!