Why can't your nose be twelve inches?
Because then it would be a foot.
Twelve-Inch Nose
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Explanation
Explain Bear
Listen up, buttercup. This joke is all about wordplay. A "foot" is a unit of measurement that's twelve inches long. But they're also talkin' about your stinkin' foot that you walk with. So, if your nose was twelve inches long, it wouldn't be a nose anymore, it'd be a foot. Now go back to watchin' TV, ya goof.