A Fish Called Buddy

S4, E10: When Charles is kept after class to correct papers, Buddy volunteers to take Adam to the dentist. But in his typical irresponsible fashion, Buddy forgets. Charles feels let down by his best friend once too often, and decides it is time to end their friendship. The argument is temporarily forgotten when Charles finds out that Buddy has accidentally inhaled an angel fish while cleaning out his aquarium. Lodged in his windpipe, the fish has cut off his oxygen supply, and now Buddy lies unconscious in the hospital.