I wonder what sort of equipment he was using. Especially if it was a toothed or pin-style of jackstand. I really, really dislike the toothed variety. The pin-style seem much, MUCH more foolproof in my opinion. Of course, the best protection is redundancy, redundancy, redundancy...

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-1985 300TD - 324k mi on chassis. MB "Tauschaggregat" 617 motor + 4-speed conversion
Alaska Roadtrip 2009
-2002 E320 Wagon - 197k mi
-1998 E320 Wagon - 310k mi - retired