When it came time to pay, the skunk didn't have a scent, the deer didn't have a buck so they put the meal on the duck's bill.
or
To hide in a bag of M&M's.
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In the neigh-borhood.
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Bike helmets don't fit hippos
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Norse code.
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Because an undocumented worker has been living on his head for the past 2 decades!
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Because sometimes you can get rid of cancer.
or