Charm City Knockerball, Baltimore

If you've ever watched regular soccer and thought it looked fun but there weren't enough people smashing into each other, knockerball might be for you. People still smash into each other in knockerball—it's kind of the point—but now they're wearing a giant protective bubble. Players inside these inflatable battle orbs try to score goals while safely careening into each other and bouncing off the ground. KnockerBall not only hosts knockerball games, but also rents out its inflatables for private parties such as birthday bashes or bachelor nights and corporate events.