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In 1997, HBK was supposed to wrestle Bret Hart in the main event of WrestleMania 13 and drop the belt to Hart in a rematch to their WrestleMania 12 match where HBK won the title.

HBK and Bret Hart didn't get along and he didn't want to do the job so a month before Mania, he came on RAW with a doctor's note and said that his knee is injured and that he has to retire and that's when he said that he lost his smile and will go back home to find it

He then returned full time to wrestling a couple of weeks after WrestleMania 13, miraculously fully healed.

I used to follow WWE and was confused too. Seems to be an old Internet meme? Lol there's a reddit thread from 11yrs ago and lots of results on Google. https://www.reddit.com/r/SquaredCircle/comments/1agvvy/can_someone_explain_me_why_shawn_michaels_lost/

Back in the mid 90s Shawn Michaels was the WWE (Then WWF) champion. He was supposed to be going into a storyline with Bret Hart and he would lose and drop the world championship to Bret. Shawn was a notorious dick during this time and had massive issues with Bret in real life. So Shawn basically came up with an excuse why he couldn't work with Bret and that he had to take time off. So on an episode of Raw Shawn came out and told this big story of how his mother was saying he wasn't himself lately and that he "lost his smile."He said he would vacate the title and leave the WWF to find his smile again. The whole thing was a shitty copout on Shawn's part and became a meme in wrestling bubbles.