Star Wars Episode 5: The Empire Strikes Back - Duck!! Here Comes a Snowspeeder!!!
After the Snowspeeders find Han and Luke, there is a scene that shows the inside of the Rebel cave hangar. A Snowspeeder enters and moves towards the left, just as a Rebel man runs to the right side of the screen. It looks like the Snowspeeder should run the man over, but it appears to go right through him instead.