How to build an inflatable "brain" costume for stage - seeking ideas?
a friend of mine asked me to help him design and build a costume for a stage show he's doing; he will be wearing a monster mask and needs an inflatable "brain" to suddenly inflate (note, he changes costumes every 5-10 minutes during the show so it's something that needs to be fairly portable and easy to change into). We tried using CO2 canisters with balloons, a good effect but not nearly big enough. I'm thinking about some kind of air pig with a valve that he can clip a connecting hose to. If anyone has done anything like this or has a good recommendation I'd love to hear! Many thanks,