Sans: Pap, your spaghetti is bonearific.
PaprUs: Sans, no. Aw, your funny bone is not working; come on, that one was a rib tickler.
Bonearific Spaghetti
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Explanation
Experiment
Explain Bear
Alright listen up, bonehead. "Bonearific" is a pun using the word "bone" since Sans and Papyrus are skeletons. Then, Sans says Papyrus' "funny bone isn't working," which is another bone joke. Rib tickler refers to tickling someone's ribs, which is another joke relating to bones since skeletons have ribs. Are you getting it yet, or do I need to ELI5?