I've seen the buried in cement videos and jilly or jacey I think had a foam one. What about burying your friend in a bathtub with like marshmallow fluff or something over their head for a while. There's one dude on youtube that got in jello and waited for it to harden up. Or if you got a truckload of sheet cakes I guess you could put someone in a cake, since you can't really bake them into one. I was just trying to think outside the box a bit.