our consumer investigation into what really happens at movie theaters. From how you're persuaded into buying more popcorn or how clean or not those floors might be and those seats. What about those? A... See More
our consumer investigation into what really happens at movie theaters. From how you're persuaded into buying more popcorn or how clean or not those floors might be and those seats. What about those? A theater owner confesses all and nick watt has the info. ♪ Reporter: You're packed inside a big dark room with a couple of hundred total strangers. What's that smell? What is that guy doing? Is that legal? That can't be clean. There's nothing more crazy than owning a movie theater. Reporter: Have you ever caught somebody in the moment? Yes. But if nobody complains let them get away with it. Reporter: What I always complain about are the prices. 8 bucks for a bucket of popcorn that cost, wait for it, maybe 8 cents to make. 10,000% markup. Seriously? Daylight robbery. Well, not exactly. I make money by selling concessions. Reporter: Because here's a little-known fact, up to 70% of your ticket price goes to the studio and distributor leaving the theater owner with pocket change. You got to do little tricks to get them to buy concessions. Reporter: Okay, like? In my theater, I've got an exhaust pipe that runs from the popcorn machine into the actual auditorium so they'll have to come out and buy popworn. Reporter: Wait until you Lear this. They got to go. Reporter: Robert, who, remember, will never break up a court in couple will kick you out for cell phone use. You've got a stricter policy on cell phone use than you have on having sex in the theater. Absolutely. Reporter: Tough rules but all in the name of enjoying a night at the movies. For "Good morning America," nick watt, ABC news, Los Angeles. So that's the popcorn you smell. All right, well, you can see more of these and other true con federal governments tonight on "20/20" 10:00 P.M. Eastern right here on ABC.
This transcript has been automatically generated and may not be 100% accurate.