I took up boxing my senior year of high school once football was over. Got through about 6 months, and started prepping for my first event... only to suffer a boxer's fracture.
The kicker? Didn't do it at boxing. Broke it on a friend playing the punching game at a graduation party. Dumbest sh*t ever. (I later cut the cast off on senior trip at Myrtle Beach. Good life choices happening around then.)
Never got back into it after that, and I still wish I would have gone back once my hand was healed up. I started playing a yearly rotation of intramurals through college, and now do the same at a local park.
I've been looking around for good classes to take lately to get back into boxing, though. No desire to actually compete or anything. It's just a good, unique workout (though not as "unique" as other martial arts). I know some guys that run a gym, but their only strictly-boxing class right now is all high schoolers. Waiting on more interest in an adult class before I make a fool of myself in front of younger kids with my out-of-shapeness.