The doodle, which you can see in the clip above, sets the scene as such: A drive-in playing a horror movie for a variety of moviegoers, from a girl yawning and putting her arm around an unsuspecting boy to a few kids playing in the back of their family's pick-up. Soon enough, a monster appears on screen, which is then followed by a familiar scream. But before the audience gets too scared, it's intermission. (I caught four hidden Googles along the way -- the intermission, the license plate, the candy and the popcorn bucket.)
When the drive-in first opened in 1933, the cost for a ticket was 25 cents per person (it cost another 25 cents to bring the car in).
In addition to the drive-in theater animation, Google has created countless memorable Doodles over the years, including one for the 30th anniversary of the arcade game Pac-Man (which was Google's first interactive logo), along with a short music video of "Imagine" to commemorate John Lennon's 70th birthday. Most recently, they created a playable synthesizer in honor of Robert Moog.
You can check out the rest of the Google Doodles here, and your nearest drive-in theatre here.