So I remind myself of the video I posted here (Edit: Video was deleted) and feel an urge to find me a nice big ball like that. Toy stores didn't bear the fruits I was looking for, but ebay did:
http://www.ebay.com/itm/5-Sponge-Ball-M ... 5d3468ca0f
It seems about right. Very squishable so you can fit it inside, color's similar, but I don't know.. The glitter on it and the texture seem wrong. What would you guys say? Does that eBay ball look safe for a couple hours in your mouth? Also if anyone's a magician, just how soft are we talking here? Will it actually impede speech or just become marble sized? Most importantly - would you like to see if you can escape my binds? :3