I have taken this image from Jackie Chan’s Wikipedia page. This is a picture of Jackie Chan working as a stuntman in the 1971 Bruce Lee film Enter the Dragon. Bruce Lee (left) is “snapping” Jackie Chan’s neck. Unfortunately there are no higher resolution image available.
Just goes to show that with hard work and dedication and also with some luck lots of things can be achieved.
Next time I am watching Enter the Dragon I will make it a point to look out for this scene.