Swell
Play your drum under the moon and your hair will swell! The more you play and the longer it's under the moon, the larger your hair will swell.
Have you been suffering from flat, boring hair? Well do I have the swelling treatment you've been looking for!
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Using this method, your hair swells so much it looks like a giant bowling (ぼう) ball is sitting on top of your head. It's all round, and well... swollen is probably the only word that fits.
Imagine watching your hair swell to the size of a large bowling ball. Imagine never being able to go bowling again because the comparison is too easy for people to make.