I think I do that every time I turn the TV on!
We only go 2 or 3 times a year because we prefer the premiere lounge which is reclining seats and food & drinks served at your agreed time. There are only about 40-50 seats in each theatre/lounge, and only 2 "lounges". We tend not to go to the normal ones now.
No one bats an eye about you pulling out your own snacks or picnic if you get drinks from the licensed bar (not that we drink, but you get the idea).
I have a home theater, where I can eat or drink anything, and pause the movie to use the bathroom.
But, there are some movies I will pay the ridiculous price to go and see in a cinema, just for the giant screen, and shared experience with a bunch of other people.
CD