Yes, you can inflate your belly with a balloon. The process is simple and only requires a few household items. First, you'll need a balloon. Any kind of balloon will do, but a large beach ball or exercise ball is ideal. Second, you'll need a straw or some other type of tube. This will be used to blow air into the balloon. Finally, you'll need something to tie the balloon off with once it's full. A piece of string or ribbon will work perfectly.
To begin, blow up the balloon using the straw (or tube). Tie it off when it's as big as you want your belly to be. Next, gently press the inflated balloon against your stomach. You may need to hold it in place for a few seconds while the air pressure adjusts. Once the balloon is snug against your skin, let go and enjoy your new temporary paunch!