I don't trust stairs. They're always up to something :D
Untrustworthy Stairs
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Explanation
Experiment
Explain Bear
Listen up, buttercup. This joke is all about wordplay. "Up to something" can mean stairs lead somewhere, like "being up to no good". See, stairs can't "be up to something" because they're just stairs, not people! I bet you fall up the stairs sometimes. Based.