And just what exactly is 70s-80s food ?
For us, that might be fishsticks and veggie medley, Hamburger Helper, Dominoes Pizza (delivered, natch), salisbury steak TV dinners, Mac 'n cheese, pudding cups (pudding in a can is preferred but has been disco'd FOREVER), taco flavor doritos, Jello salads, etc. All foods that really became widespread in the 70's/80's.
As a connoisseur of MRE's, I also have a couple older MRE's from the late 1980's that we'll sample soon enough. If we're watching war movies we'll eat MRE's. If it's a car movie, we'll go to a nearby diner and get burgers and fries.
You know... health food.
ETA And the movie has to be:
1. On VHS
2. Older than 1990 (Sorry, Home Alone!)
3. Newer than 1969 (Sorry, True Grit!)
4. Preferably feature music, cars, or prominent actors of the era.
5. No throwbacks. (Sorry, Dazed and Confused!)
6. If it's a movie we know that has product placements, we'll do that too. If it's E.T., we'll eat Reeses, if it's Dirty Harry, we eat hot dogs, and so on.