Hmm... really brings up the question...
What type of movie, or aspects of films, would be better at a drive-in compared to a regular big 70mm in-door movie screen?
Most people went to a drive-in to get smoochy with their dates. For that, I guess scary, but not repulsive.
Otherwise, might be a group of friends in a big convertible or reclining on the car, enjoying some silliness -- Return of the Living Dead, Ghostbusters, Shaun of the Dead or Young Frankenstein might be good for that.