I,also,remember going to drive in. The first movie I ever remember seeing (as fragmented as the memory is) was a re-release of "Goldfinger" (it took me years to learn what the movie was! Ha! Imagine my surprise as a teen to just stumble upon it while catching up on Bond flicks in the vhs era) at the long-gone (but it was very cool) Winchester Drive in (with 6 or 8 screens) in San Jose, California. When we moved to Fresno, there was the Sunnyside (with 2 screens--the main screen, at one time, was billed as the World's Largest Screen and some movie premiere had been held there when the theater first opened in the 50s or whenever),the Starlite (2 screen), Moon-Glo, Sunset, Motor-In (on the outskirts of town--showed a lot of T&A titles. Oh my STARS!!! Ha!). The last built (and the last to close) was the Woodward Park, a 4 screen theater. I saw "The Sixth Sense" there and I think the theater closed the next year.
Last year I was visiting Whidbey Island in Washington and there was the Blue Fox (???) drive in there. That was a hoot. The snack bar was beautiful--and they had great pizza. Ha! They also had a racetrack on the side. The time I was there they had a garage sale. No posters, but I did buy myself an old theater speaker (they had switched from the old-fashioned speakers to having the sound come through car radios several years earlier---and were just cleaning out their old storage shed). The speaker I got though had the name of a different drive-in (also in Washington) printed on it, as if that drive in had closed and the Blue Fox bought its speakers before going with the radio version? I don't know, but it was fun!
Attached are some crappy phone pictures of the place (Whidbey Island's Blue Fox Drive In). The snack bar was much nicer than it looks here. It was a fun night.
(http://i9.photobucket.com/albums/a66/boinnng/Drivein1b_zps1ac1ddc9.jpg)
(http://i9.photobucket.com/albums/a66/boinnng/Drivein2snackbarb_zps715e0d7a.jpg)