My Father, the smartest man I ever knew, explained to me how planes fly. The air on top of the wing is less dense than the air underneath. Nature abhors a vacuum (and so do I when it comes to these door locks, mine are now electric) and so the air underneath the wing attempts to push itself upward into the less dense area...causing lift. If the design of the car includes a wing (a spoiler for those in Boca) which it did, then it is entirely possible that the car could be driven upside down for as long as the necessary speed and lift was available. Considering he was upside down for less than a second, I have no problem believing that the commercial is legit.

and I'm kinda turned on by that video.

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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg