If you have to break up a fight, you might get a stray punch thrown in your direction. And there's a lot of breaking glass (even when there aren't fights), so...try not to get any shards buried in your feet or forearms. You'll also be on your feet a lot, so sore calves and spurs aren't unheard of.
Odds are, though, there's some sort of safety guidelines your manager gave you when you started—that we'd wager a hefty sum of money on you having ignored. We know it's lame, but how about giving it another shot and reading up on workplace safety just for us? Pretty please?