I have a hazy memory of being at a Drive-in with my parents when I was maybe 4 or 5 yrs old. I know one of the features had "Boggy Creek" in the title because I kept saying "boogie creek" until my father yelled at me. They made me and my sister lay down and go to sleep during scary or sexy movies but I would always peek over the front seat. Now here's where you can help me. At some point in the movie did the beast reach up through a toilet while a girl was "sitting" there? I remember that scene clearly but I don't know what movie I saw it in. Was that "The Legend of Boggy Creek"?
Thats the one. Except the bigfoot broke through the bathroom window while she was on the toilet.. did not come up through the toilet. Saw it at the drive in as well, but was old enough to be allowed to lay on the hood of the station wagon and watch the whole thing! I think the first feature was the seven ups... good times, despite the mosquitoes.