My Parents-In-Law were kicked out of this movie!!

That's what they say anyway. They say they went to see this movie at a drive-in in 1975 when it opened. My wife was a little less than a year old then and they had her with them. The story goes they got through the box office OK cause my wife was lying down in the backseat. They were watching the movie and my mother-in-law her my wife sitting in her lap and this dorky teenage boy who worked there came running up to the car about to have a fit going on about how they couldn't bring a child to this movie and how they didn't see her while they were coming in and about how they - MUST - leave at once!!