How did that happen? Is this common? Is it air pressure differential that does it? I have heard of people's sunroofs getting sucked out on the freeway. Somebody explain this to me.
Will the same thing happen to me?

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'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)