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I grew up in Texas also, and they were very popular in the '60s-'80s, although by the late '80s they had begun to dwindle. It's difficult to explain the appeal of a drive-in if you didn't grow up with it, which I did. The whole family would pile into a car (or truck) and go. There would always be double, and sometimes triple-features for the price of one carload most of the time.
As a kid, if you were bored by the movie your parents picked, some drive-ins had extra screens showing other films. I can remember turning around in the backseat and watching more interesting movies, albeit without the sound. It was really more of a communal event thing---the cinema is still the best place to see a movie, IMO---but being there with family and friends was the true draw. Plus, there was the concession stand that sat in the middle of the property, usually a one-story structure with a smaller housing on top that contained the projectors. The food at the stand was all junk food, sure, but it was fun to go there in-between movies and load up. Or, you could bring your own food in and the owners wouldn't be the wiser. Lots of good memories at the drive-in. I wouldn't go now...like Critics said, the heat right now in Texas is horrible, although there's usually a mild breeze at night. Still, if you don't bring lawn chairs or camping chairs and sit outside the vehicle, you're likely to be melting before long. It is pretty much a lost experience for the most part, although Texas still has several, as stated above.
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"Miss Jean Louise, Mr. Arthur Radley."