Wow, that is just unbelievable!!! I would think that would take a number of days or weeks to happen. You would think the owner would check on his garage a little more often! He has a serious leaking roof, unless a water pipe broke.
I don't think it is. Look at the suspension on the VW Cabrio. It is completely loaded, the wheels are going up into the fenders, like the suspension is bottomed out. With ice dams on the roof it would be possible to have a severely leaking roof.
That's a hella lotta frozen water - seems unlikely you'd get that much water off a roof through the building to freeze on the cars and 6" deep in the garage. I'd say that was a broken-pipes-while-away-for-an-extended-time kinda deal.
That picture's been around for a while - the story I saw originally was that the owner was on vacation.. I'd hate to come home to that!