It should be noted that Bill Bellichick really isn't miserable. At all. He just doesn't show emotion and is very short with the media.
He's obviously a robot and perfectionist when it comes to football, but I've seen plenty of him when he's not "on the job" and he's pretty relaxed.
Just as he never acts like a clown, he also rarely acts angry or snaps. You never see a Parcells or Cowher type reaction/press conference out of him.
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