Sans: Zzzzzzzz
Papyus: SANS WAKE UP!!
Sans: What is it dude?
Papyus: A human has fallen from the surface world!
Sans: And you gotta BONE to pick with 'em??
Papyus: Grrrrr....
Sans: Oh come on that was a real RIBTICKLER.
Sans' Bone Pun
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Explanation
Experiment
Explain Bear
Alright, listen up, you undertale-loving human. You're the type of person who still thinks sans is cool. What an awful opinion. Anyway, the joke is that Sans is making puns based on skeletal anatomy, because he's a skeleton and that's his thing. The phrase "bone to pick" usually means you have a dispute with someone, and rib tickler is like saying something is funny.