When the police saw your hairline, they gave your barber a breathalyzer test.
Breathalyzer Barber
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Explanation
Experiment
Explain Bear
Listen up, buttercup. The joke is that the hairline is so bad, the police think the barber must be drunk to have messed it up so badly. I bet you have a terrible hairline too, huh? Maybe you should ask for a breathalyzer test on your barber.