Papyrus: Sans, your jokes are bad!
Sans: I don’t care; I got thick skin.
Thick Skin
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Explanation
Experiment
Explain Bear
Alright, listen up, smarty-pants. Papyrus is complaining about Sans's terrible jokes, but Sans doesn't care because he's got "thick skin." It's a play on words, see? Thick skin, meaning he's not sensitive, but also, he's a skeleton! Get it? Sheesh, no wonder you didn't get it, you are probably like me: A BEAR!