Up you geek score with this giant Inflatable 20 Sided Die. As frequent readers of Craziest Gadgets are clearly aware, we love everything inflatable here (read that as you will you freaks… listen if it’s good enough for James Franco, it’s good enough for me). So yeah this 17 inch die can get you double bonus invisible nerd potions in Dungeons and Dragons… ok it’s pretty obvious I’ve never played the game, so I’m sure it’s useful for something good. At the very least, it will impress your friends. $11.99.