Blitzball. Underwater battles.

You wouldn't happen to have to have one of those (I want to say they are made by nerf, but I can't be sure of that) underwater football things (looks like a those vortex footballs I think) that is sort of weighted to have a good equilibirum with water so that it won't float or sink?

that would be really useful for blitzball.

Also, gills.

no gills but I mad a nerf soccer ball that could stay under water and still have a little float to it. gills people just go up for air.

Well you could have the pool thing and try to play soccor with it in the pool?

Awww... come on!! if they can have a bathing suit cosplay parade, a little game of Blitzball can be done!!!

...and who ever said it had to be "planned"? YAY FOR RANDOM!