Mictlantecuhtli kindly posted links to three older answers in "When/How did popcorn become so strongly linked to movies and movie theaters?". The answers were by /u/texpeare, /u/Gadarn, and /u/tunaman808.

This is not to discourage discussion. More questions, data, and debate are welcome. In this case, the answers were under older standards, and one had a lot of digressions.