My friend works at a dealership that sells SMART cars. She tells me all the time about how big they feel and how safe they are for their size. All I do is wonder aloud to her about how well they would do "for their size" in an accident against a Ford F350 that's lifted with a bull bar and winch on the front that just ran a red light at 60mph. Clearly no vehicle would withstand that well, but if you're in an Excursion or any large SUV/truck, you're going to have a better chance of surviving purely as a matter of physics.

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2001 X5 4.4i
2002 Honda S2000