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You didn't say if you had the e-brake on, or if the wheels on the oppoite side were chalked.
Did the jack collaps with the car rolling forward (backward) or with the car moving sideways (this is possible when the suspension flexes while one wheel is off the ground). If the jack isn't properly positioned under the car (vertical) it takes very little side load to start movement with drastic results.
I agree with others who say "don't get under any car that is supported on a jack, always use a "jack stand" that locks at the set height. Then rock the car in both directions to see if it will come off the stand.
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