That's because he's a raging alcoholic.
seriously, every time I go to a deftones show, a guitar tech comes out and say something like "oh, Chino's sick, sorry guys, guess you'll just have to watch Godsmack/Whoever for another hour." Sick my ass! that fuckin' drunk!!!!
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It's exactly what you think it is. My own little 'Fuck You' to the world.