Someone asked my wife this question but I'm not sure I have an answer?
"Hey Tara, I'd like to engage your enormous knowledge of horror films, please! This is a film, possibly made sometime in the 80's-ish, where in one scene a guy eats a burger and then falls to the floor, his stomach opens and all these horrible little batlike creatures come flying out! A friend is being driven nuts, trying to remember!!! Thanks xxx"