Have you ever been the fool of a prank or joke on April Fool’s Day? x
Headcanon: The Slytherin Prefects having a rough batch of first years who are crying/upset about being in Slytherin when they reach the dungeons. So they go get Professor Potter, who is not much better with crying first years, until he's honest with them. "Look I didn't want to be in Slytherin at your age either, but I can tell you I'm proud of each of these Slytherins, and I know I'll be proud of you too." The Prefects being at first annoyed, then reluctantly enjoying his frankness.