Wow, looks like that screen could take a direct hit from a tornado and survive!
Knucklehead friend used to put his buddies in the trunk when driving in. Worked good until one of them broke wind right when he was paying. They caught the bozos and made them drive out and go to the end of the line!
I snuck friends in drive-ins , back in my teens.
for the most part after that one closed, I used to only go to all nighters
when they charged by the carload. So sneaking wasn't an issue, Just semantics
of What was a "Carload"