Seriously, there is nothing good about it. harder to take care of and looks worse than short hair. It makes it easier to get pimples and bedhead and harder to get girls. Why ever would anyone let their hair get long?
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You ever heard of dreadlocks? I've seen some damn fine dreadlocks. Mohawks too, that requires somewhat long hair if you want to have it really spiked up. And some people just look good with long hair.