Here's what NOT to do with a Steadicam.
The fatal mistake? The operator let the arm extend too far from his body while leaning back (and away from it) simultaneously.
Watch the video below, and be sure to note what not to do (when in doubt, read a manual!):
If you found that too depressing, here's a beautiful montage of some of the smoothest and most innovative Steadicam operations in movies to keep your spirits aloft.