Your hairline left you because you were too ugly for your push back hairline.
Ugly Hairline
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Explanation
Experiment
Explain Bear
Alright listen up, smarty pants. The joke is about how ugly you are. Your hairline didn't just recede, it straight up ran away because even it couldn't stand to be near your face. And the "push back hairline" is just adding insult to injury, saying your hairline is so bad it's actively trying to get away from you. Get it now, or do I need to draw you a picture?