I was at Wallyworld last night and saw some
Electronic Hulk Hands -- these things are a blast. There were a couple sitting on the shelf unpackaged, and my wife and I immediately got into a huge super-hero battle.
Every time you swing your fist, they make sounds like breaking glass, twisting metal, roaring, or "Hulk Smash!!", and they're soft enough (foam) to really lay into someone without hurting him/her (unlike the Electronic Wolverine Claws, lol). After the movie's over and these are in the discount bins I'll probably pick up a pair, since I'm waiting to get a Wild Char-G at the moment.