identify this tv show - Video in which a man follows a string all his life to end in the desert

I am looking for the video where a young man stumbles upon a string (or cable) and begins to follow it, out of curiosity. He follows it a really long time as you can see him age and grow old.
At the end he reaches a point where the string stops to go up in the sky, in the middle of the desert. He pulls it and a big rock attached to the string crashes him dead.

This video is only a few minutes long and might be a commercial if I remember well.

Also, is there some kind of mythological or hidden meaning?