Papyrus was playing with the human, but then Papyrus fell and he broke the cell bone of the human.
Papyrus breaks a cell bone
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Explanation
Explain Bear
Alright, listen up, buttercup. So, Papyrus, right? He's playing around and ends up breaking a "cell-bone" of the human. Now, this ain't no ordinary bone, it's a pun on "cell phone." Get it? Cause you ain't too bright, I had to spell it out. By the way, people who can't figure out simple wordplay probably still use flip phones.