Not the best (definatley not the best!)
Found a VHS video in a layby at the start of our local 10 mile time trial (this was about 20 years ago). Friend took it home and later that week insisted I watch it.
So anticipating some hot sexual action film, I was disturbed to find it was a taping of the film ‘Wicked Lady’, which half way through was overtaped with a film of a man setting up his video camera, taking his trousers down, and me swiftly switching it off!