Papyrus: Sans, I have a joke. What do you call someone lazy and incompetent?
Sans: What do you call them?
Papyrus: YOU! NOW GET UP AND CLEAN YOUR ROOM, YOU LAZY BONES!
Papyrus: Sans, I have a joke. What do you call someone lazy and incompetent?
Sans: What do you call them?
Papyrus: YOU! NOW GET UP AND CLEAN YOUR ROOM, YOU LAZY BONES!
Alright listen up, dummy! The joke is funny because Papyrus asks Sans a question about someone lazy, and then reveals that he was talking about Sans the whole time. It's funny because it's unexpected and also because Sans is a lazybones!