[Plenty of time for Sans to grab the bolt later, when Papyrus isn't around, and throw it out. He'd put it back with the rest of Papyrus's stuff but he can't be completely sure Papyrus wouldn't recognize it somehow. For now, he places it under the couch. Problem temporarily solved.]
I'd better be invited if you do. [Sans is already preparing for theoretical future burgers.]
Making good burgers and not inviting you... That sounds like a punishment for something. [Great idea, Sans! He's only half-jokingly tucking it aside for later.
As for the bolt - he absolutely memorized its appearance to better recognize it if it did wind up in the workshop.]
I'm sure you wouldn't! And yet, you do love to surprise people. [Anything bad enough to warrant denial of ghost burgers would be very serious, don't even try imagining what would require that.]
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I'd better be invited if you do. [Sans is already preparing for theoretical future burgers.]
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As for the bolt - he absolutely memorized its appearance to better recognize it if it did wind up in the workshop.]
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I don't think Papyrus will solve this mystery in time, ghost hands out of sight out of mind