Won a Divorce with Movies of His Faithless Wife (1939)

The January 8, 1939 San Antonio Light (San Antonio, TX) ran this article about a suspicious scientist who filmed time-lapse photography of plants. He thought his wife was cheating on him, so he set up a camera in his living room when he was away. He caught his wife cheating and played the movie in court to win his divorce. Pretty awesome use of technology for the late 30s.