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Athletes, and boxers, in particular, are notorious for being unable to stay retired. "The Greatest" was no different. While still holding the heavyweight belt in 1979, Ali retired at age 37. He came back the following year to fight, and lose badly to, Larry Holmes. Despite calls for him to retire for good, Ali, seen here in 1983 with President Ronald Reagan, fought one last time on Dec. 21, 1981, losing a 10-round decision to Trevor Berbick.
Whatever their reasons, more than a few stars have decided to walk away from their chosen fields only to get the itch and return -- some more than once. Take a look at some celebrities who have "unretired."
A 36-year-old woman was flown out of the Kahaualea Forest Reserve on Wednesday after she sprained her ankle on a hiking trip to see an active lava flow.
The voices in the video tell the story.
"Something crazy is going on outside," a woman shouts. "I'm scared."
Moments later, the same voice yells that a tree has fallen and another says, "It's on that guy's camper."
Overturned campers, downed trees