My standard answer is: jealousy. But it is deeper than that. You are very exposed in a convertible (even much more so than a targa). You can't pick your nose etc. So it helps if you're a bit of an exhibitionist. 
Ian
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'87 Carrera Cab
----- “Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.” A. Einstein -----
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