I worked for several years at a sit down theatre, starting in the summer of 1977. We had hot dogs then and nachos were introduced a year or two later. The hot dogs would often sit in the steamer for several days, if not a week or two at a time. (They were refrigerated at closing and re-steamed the next day until sold.) We employees knew to eat the hot dogs from the back of the steamer , leaving the old ones in front, which often had a greenish tint to them, to the patrons of the theatre.
I always thought that nachos were a little too messy to eat in the dark and the chips quickly got soggy from the “cheese” topping.
I remember seeing the original Texas Chainsaw Massacre at the drive in around the same time. My friend and I had consumed several Shlitz Malt Liquors and decided to get something to eat. We were the only ones in the snack bar and the girl behind the counter asked us how could we eat with that movie on. It didn’t affect our appetite for the pizza we ordered at all.