They are huge inflatable balls with a zipper. They are blown up for each person, they get inside and then tries to walk around in it in a shallow pool of water. 3 minutes = $7.00.
There was always had an audience and it looked like everyone who tried it had alot of fun. The helpers were always in the pool to help the ones in the bubble get around because they always fell down after a step or two.
Herbscraftsgifts eBay Rubber Ducks
Added 9/27/10 Just found this video on YouTube - Video EuroBubbles