Forget about buying a ticket for one movie and then hopping from one theater to the next. Forget about buying a ticket and then slipping your friends in through the fire exit. If you really want to cheat the system and sneak your buddy into the movies then you need to take lesson from cartoons and go as one person.
That's exactly what two dudes did when one guy latched onto the other and they threw on a giant shirt for disguise. Personally, I would have opted for the trench coat as a nod to Rugrats, Ducktales, Adventure Time or any other cartoon, but regardless it worked!
Sure, it's a lot of trouble to go to in order to avoid paying an extra $10, but the inventivness alone is worthy of a free popcorn.