ducks is head because duck have heads

What kind of scary a** clowns came to your birthday?

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Ducks have tails and clowns have heads. That would have been the logical approach.

"We could flip for it?"
"Well yeah. But I mean what's heads and what's tails?"
"Well if you don't know, then I don't wanna do this with you."

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"But my job's fun too - I mean, tomorrow I don't have to wear a tie." - Chandler