Firstly when you need to buy your coke and popcorn, its ridiculously expensive. Secondly, they dont give you a bill and then you insist for it, then they remove one from the drawer and tell you that they cant print new one cause that wasdouble billing.
Now this has happened to me 3 time in 3 weeks. So I find this system really fishy. From what I think, they are recycling the bills and collecting cash. Many people dont collect the bills so they just keep passing to the next customer. This way they dont need to account for the product and they get the product price+tax from the next customer!
Beware.