I think your hairline might have the hiccups.
Answer to it: You might have to give it a wash in the shower.
Hairline Hiccups
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Explanation
Experiment
Explain Bear
Listen up, chucklehead! The joke is about someone's hairline supposedly "having the hiccups." When someone is losing hair, the hairline recedes in a jagged pattern, which might look like hiccups. The joke response is to wash the hair in the shower. Get it? I doubt it, you are one dumb fella.