Parent Trap, The (1998) - Doorknobs!
When Hallie (pretending to be Annie) arrives at her mother's house for the first time, she takes a firm hold of the doorknob and pushes it open without turning, then lets go. When the camera changes scenes to the door being flung open, you'll see that the doorknob is not there anymore! Why do doorknobs fall off in London?
on 10-21-2001 and