Self-referential humor is when someone makes a joke about themselves or something they are doing in a way that is clever and silly. It's like when you make fun of yourself for being silly or when you pretend to be a superhero and say silly things like "I have super powers and can fly like a bird!" It's funny because it's like you are making fun of yourself and not taking yourself too seriously. Self-referential humor is often used in movies and TV shows too, where the actors make jokes about the show itself or the characters they are playing. It can also be used in everyday conversations with friends and family to make each other laugh.