Monty Python and the Quest for the Holy Grail - Superimposed Black Knight
Jump to the scene where King Arthur is fighting the black knight. Pause at the shot when King Arthur cuts of the knight's second arm, hit slow-motion. Arthur's sword hits the knight at the wrong direction. This reveals that the knight is super-imposed.
I spotted it while watching it for the first time. I just checked to see if I saw it correctly.
on 02-01-2001 and