I always thought it was all the headbanger tantrums he threw ever since he was a kid.
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If you look at his head in this video you can see the angle of the line at the back of his head I drew in big red Sharpie.
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When he bangs his head the angle straightens, like a faggot after he realizes that weird shit ain't for him. This could possibly be because of his fucked up posture, he slouches literally doing anything.
I'd like to rebute

with the fact that he has banged his head on a tree, asphalt, and linoleum tile floor. Though this is usually only when cops are around, presumably to get held on a 941/302.
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I'd also like to reiterate that he has a fucked up posture, so that's possibly why he had to do the bending.