Since every car I'ver ever owned has had popup lights, I just pop them up and down real quick. It fits for the Miata because its like the automotive equivilent of

or
otherwise I usually stare at them until they realise "Hey, you've got a Miata, and hey, me too, thats cool" in which case (only two to three times thus far) I'll smile and flash the peace sign hippy-style
Originally Posted by
Troux
Edit: I'll give a thumbs up to something that obviously doesn't get it much, like a clean MK3 Supra
Well in that case I follow them till they park and talk with them