I haven't seen mine yet except in pictures, but on the Miata board I frequent I already got a "I thought that was a Ferrari" but it was probably because he glanced at the thumbnail, once he opened the pic full size he recognized it as an NSX.
I can't believe anyone would think of a Corvette when seeing the car, the design "language" is all different.
In a few months I'll get to meet my NSX and contribute to this thread, I'm sure. I'd bet many Fayetteville, NC locals have never knowingly seen an NSX before.
A lot of people mistake it for a C5 Vette, as they share a similar side profile. This is no accident however. Chevy designed the C5 after purchasing, dissassembling and analyzing a NSX.