If you've seen Harry Potter and the Prisoner of Azkaban, then you probably remember a certain scene involving Hermione Granger (Emma Watson) and Draco Malfoy (Tom Felton).
Yes - it's the punching scene.
The iconic moment will go down in history when Harry Potter's enemy got what was coming - and although we later grew to love Malfoy - it's still a great scene to watch even though you know what's coming.