When you got on an airplane, the flight attendant asked which hairline you were flying with.
Which Hairline?
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Explanation
Experiment
Explain Bear
Listen here, buttercup. The joke is playing on the word "hairline" (the edge of someone's hair on their forehead) and "airline" (a company that provides air transport for passengers and freight). It's meant to be a silly, pun-based joke. I wouldn't expect you to get it, since you probably still think the earth is flat.