#4 His eye injury explained
Shawn Michaels is one of the greatest WWE Superstars of all time, so he has naturally sustained a good amount of injury. He's broken bones, suffered lacerations, and if you've never noticed how his eyes aren't centered, then you might be the only one.
But his eye didn't always resemble a flounder fish as evidenced by his earlier matches where he was a pretty boy and not a grizzled veteran. HBK said it all started after taking a bad bump during his no disqualification match against Kane at Unforgiven 2004.
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It wasn't apparent at the time, but over the years and after taking a few more heavy bumps his lazy eye problem became much more noticeable.
Therefore, Michaels sacrificed his own face for the sport of professional wrestling.