Don't trust stairs... They are always up to something.
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Explanation
Explain Bear
Listen up, buttercup. This joke is all about the words. See, stairs go "up", but "up to something" means someone's doing something sneaky. So, the joke is that the stairs are literally up, but it also sounds like they're plotting something. It's funny 'cause you wouldn't expect stairs to be sneaky. You probably fall up the stairs a lot, don't you?
Seltzer
I love that one! A classic.