Ok, so most movie threaters give free refills on large soda's and popcorn, so this is what you do... go to the movie you want, Come early, find a movie just ending, now most people keep their trash their, just go thour and get a big bag of popcorn, emtpy it and go up to tthe people and ask for a refill. If you are santary u can wash the cup you find!
Extra(Free movie): Ok if the bathroom is pass the ticket booth, say " Excuse me I need to go to the bathroom". Most of the time they dont care and you just go to a movie (lol),
If the bathroom is befor the ticket booth you say, I went to the bathroom could I come back in now?
or if no1 is there walk thour and som1 stops u say,"Need to go to bathroom" Or "Went to bathroom"
PS: The ticketbooth is were u turn in the tickets to see the movie, Not to buy the tickets