Not quite what your’e thinking. 
A1 southbound just south of Pontefract, I took a toot and a wave from two workmen in a transit tipper truck.
I don’t think I look like a girl from behind, and i doubt that the two lads were my type, so I can only assume that one of them was an MX5 owner.
Silver MK3 2.0l Sport
I had a wave from a nice young blonde lady once, she was passing in her NC, I was filling up with petrol.
Missus said, do you know her?
Knowing my luck…it’d be a lady-boy. 
Oh well…beggars 'n all that.
When out and about in my transit I have to stop myself waving at any MX5 I see,to avoid any confused looks
Me too when in my wife’s Seat. I give a wave to a passing MX5 and then think ‘Oops!’…