True: Shawn Michaels busted a beer bottle over his own head on a dare

When you're a slender, good-looking young wrestler, the older guys will constantly rib you and question your toughness. Sometimes the harassment can get a little personal, and the wrestler being mocked will go to extremes to prove he belongs 'with the boys' in the locker room.
This happened to a young Shawn Michaels during his first tenure with WWE. Veteran performer Jimmy Jack Funk was ribbing the Rockers for their lack of real tough guy status. The confrontation grew close to becoming a full-fledged fight, until Shawn Michaels busted a full bottle of beer over his own head.
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Michaels ended up needing medical care and had to miss some scheduled dates. Vince McMahon was furious and fired the Rockers, though they would be rehired soon after.