Although there are many heartbreaking, suspenseful, and even downright terrifying scenes in the Harry Potter movies, the Hogwarts gang also shared countless lighthearted exchanges, making the film series perfect family-friendly watching. Even the most villainous of characters had some moments of levity—Draco Malfoy, Harry’s school nemesis, included.

Arguably one of the funniest scenes in the whole film series occurs in 2002's Harry Potter and the Chamber of Secrets. With the help of some Polyjuice Potion, Harry is able to disguise himself as Gregory Goyle, one of Draco's dutiful lackeys. But Harry's cover is nearly blown when Draco sees "Goyle" and asks him why he’s wearing glasses. Harry, as Goyle, responds that they’re for reading. After a brief moment of silence, Draco replies: "I didn’t know you could read."

What makes this scene even funnier is the reveal that Tom Felton, who played Draco in all eight Harry Potter films, actually improvised the line. In a video Q&A, the actor shared that it was one of his favorite lines in the series, and explained how he made it up.