Just found this and I really wanna give it a go!
http://www.youtube.com/watch?v=2xxPBarwc5M&feature=related
Its an inflatable ball where only your head sticks out - there are no arm or leg holes. Once inflated the victim has no way of getting out as the pressure of the air holds them inside.
Has anyone in here been been trapped inside one?
Iv seen them a few times and love the look of them although never tryed one but would love to give them a go
Helium Inflation is the way forward