Your hairline is so far back, it was in a different time zone on a flight with you.
Time Zone Hairline
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Explanation
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Explain Bear
Listen up, genius. This joke is saying your hairline is so far back on your head, it's like it's in another time zone. Like, if your hair was flying on a plane, the front would arrive hours before the back. Get it now, or do I need to draw you a picture?