Long before movie theaters even arrived, popcorn was a popular snack at any early American entertainment venue.
There was popcorn in all the old vaudeville houses and burlesque shows.
It was found in places like Coney Island, the World's Fair Exhibitions, any similar kind of waterfront or pier. Any baseball stadium or racetrack. Any circus.
Popcorn was available in amusement arcades no matter whether big city or small town. Any poolhall or taproom might offer popcorn; any nickelodeon.
It was also sold in the street in pushcarts, or in public parks; similar to peanuts and chestnuts.
It's simply cheap, filling, mindless, and easy to produce in large quantities.
So the answer to your question is that popcorn was never tied specifically to move theaters; it was offered at any public venue.
We only associate it today with movie theaters today by default, because all other other venues have diminished.
Paul P. Powell, Pool Player

It's cheap and easy to make on site.

A girlfriend who worked concession at a downtown theatre told me most theaters wouldn't survive without the income from the conessions.

Cheap product to offer for an inflated price = nice profits.
The markup on popcorn is something like 600000%.
The only product that can even compare to it are soft drinks, which you will need to wash it down, btw. While we're at it, let's add in some Dollar Store style candy and offer all three in a combo for $27, marking it up from our actual cost of 45 cents. That's quite a nice profit.
What's more to understand?

I suppose you find that funny: your sleek and feminine head thrown back bellowing the most high-pitched, campy and gay-sounding laughter one would have the devastating misfortune to hear.

It gets your hands nice and buttery and slippery to jerk off or give a handjob during the movie.

I can imagine you saying that in a ridiculously posh British old lady's voice, your head tilted back with your eyes closed arrogantly, one arm behind your back and your other hand limply pressing self-importantly against your pigeon-chest.

I don't know and I don't care. I hate everything about the smelly stuff.
My password is password.

The Great Depression presented an excellent opportunity for both movies and popcorn.
Looking for a cheap diversion, audiences flocked to the movies.
And at 5 to 10 cents a bag, popcorn was a luxury that most people were able to afford.
As more and more customers came to the theater with popcorn in hand, owners couldn't ignore the financial appeal of selling the snack.
I've always been wired for unfiltered truth, no matter who it offends.

Is there any sugar in popcorn? Bingo! That's your answer. It's a naturally-occurring snack. Get a kernel and pop it. That's how it caught on during the Great Depression, most especially WWII due to low supply of sugar.
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It's because of the popcorn emojis that people post when they're looking forward to watching a fight on a message board.

I'm largely talking out of my ass here, so don't quote me on your term paper or anything lol But the first cinemas would have been around before modern conveniences like the microwave or the refrigerator. So offering something more substantial would mean obtaining fresh ingredients daily, hiring somebody to cook everybody's order, and it would take forever, while customers are missing the movie. But popcorn can be made in bulk ahead of time.
"Praise be to Allah." - President Donald J. Trump, Easter Sunday 04/05/2026