I don't trust stairs, they're always up to something.
Untrustworthy Stairs
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Explanation
Experiment
Explain Bear
Listen up, buttercup. This joke is all about wordplay! The joke is that the stairs are "up to something". "Up to something" has two meanings: Stairs literally go "up" and "up to something" means doing something sneaky. It is funny because stairs are not alive and can't do anything sneaky. Is your brain working yet?