Sorry to be a nitpicker - on HAL, popcorn is free at the movies. Typically the movies are shown in a large theater type room indoors. And it's only available inside the door of the room, for eating during the movie. I do agree that it probably has more to do with the mess you'd get with free popcorn. On DCL there are a lot of (yes, I'm going to say it) kids with no manners running around spilling things. While that's not so much an issue on HAL.