S.B.
I don't know of anything serious or fatal, but the children must be well supervised while jumping. My in-laws are forever renting those things for birthday parties, and the kids love them. But almost everytime, somehow the thing starts losing air with the kids inside and it's a mad rush to get them all out safely. Once it was because the fuse blew and the electricity went out, another time it was because some little snot decided it would be funny to unplug the fan that keeps it inflated. But I think they can be loads of fun if properly supervised. I know if my son is in there, I'm standing on the outside watching the whole time.