Hehe...
Gyro Joust: get inside a huge zero-G hamster-ball looking contraption, two stories high. Jump off any side of the sphere and crash into friends. Of course, it's padded, and so are you, but still...
Human sized hovering hamster ball: Just like it sounds. Roll in it like a hamster ball, but it hovers. The faster you run in it and spin it, you can direct it over the crowd.
Whackits: Tennis-ball-sized orbs of light that hover and move autonomously, kinda like the Golden Snitch. All you gotta do is...well, whack it.
“…Judge not what a man has done, but judge what he could have done if he was a different bloke altogether. For art thou a leper? And a leper can changeth his spots…” --Rudy Wade, Misfits (Series 4, Episode 8)