I say hi to Sans. Sans shows his hand and says, "It's hand to meet you," and we both laugh.
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Explanation
Explain Bear
Listen up, you knucklehead! So, you greeted Sans, right? And get this, Sans shows you his HAND, and then he makes a PUN, get it? Instead of "nice", he says "hand"! And then, BAM! You laugh! Because you're a simpleton!