That reminds me of my coworker and cycling pal who forgot he had his bike on the roof of his Alfa Romeo when he drove into the underground parking garage at his condo. The clips proved to be the weakest link, and the bike (a mid-to-high-end Motobecane) and rack landed upright as a unit. He did need some roof dents and scratches repaired on the Alfa, but recognizes how much worse the whole scenario could have turned out.
I have transverse load bars and a pair of Yakima bike racks for carrying bikes on the roof of the Passat wagon, but I am very paranoid about using them.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069