I had that happen to me once when I had my 1983 GMC Jimmy. I closed the door and the glass just up and shattered into a million little pieces.

It could be that a hairline fracture was at the base of the glass and one good thunk was all it needed to break completely..

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon - Sold
2006 E350 Wagon - 368 - Dead
2015 GL350 Bluetec - 197U