People (especially kids) in old movies and TV shows used to try it all the time -- sit on top of each other and dress up in one set of clothing to try to pass for a single person. It pretty much never worked. They got too tall, or someone fell, or the arms and legs and mouth did or said too many obviously contradicting things.
Clearly they were just going about it all wrong.
Two teens became determined to find a way to sneak into a movie theater as one person, paying for one ticket. And of course, their friend filmed their journey. They tried a few different set ups before finding one that worked for them. As for how it went? Well...watch for yourself.