My [blank] is long and yellow that can't swim.
A school bus full of children.
Long and Yellow
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Explanation
Explain Bear
Listen up, buttercup. This joke is playin' on the old fill-in-the-blank gag. It sets you up to think of somethin' else that's long and yellow... but then BAM! It's a school bus. Classic switcheroo. And based on your IQ I can tell you probably got tricked.