I've done it when cycling, a very enthusiastic grin, wave, then thumbs up. The look on their face is usually priceless so i assume they don't live locally 😁
Another good one is, when in a busy town/city centre, suddenly stop and look up with a look of astonishment on your face, then walk away as everyone else tries to see what you were looking at, works every time.

I used to when I was a kid but nothings stopping me from doing it now. Thanks for the inspiration

It’s not uncommon here. Not a full wave but a hand up, or the index finger up. Not on the main roads but the back roads

Yes lol

Positive annoyance - this is good :D

I’m gonna try it

i do all the time