One of the scenes is of a girl going (possibly) undercover as a waitress, she sticks a piece of...

...chewed up gum on the burger to get the psycho's favour. I think at the end of the film they chase one another through a swampy river. I thought it might have been Michelle Pfeiffer or someone similar as the female lead. I remember watching it on tv during the late nineties and it's always bugged me. The movie was pretty cool.

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