Your hairline is so far back that I didn’t know you had a hairline.
Receding Hairline
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Explanation
Experiment
Explain Bear
Listen up, genius! This joke is about how far back someone's hairline is. It's so far back that the person telling the joke didn't even realize they HAD a hairline. That's like saying you didn't know you had a nose because it's always covered in dirt. Get it? I doubt it, you're probably balding yourself.