I give a 'thanks wave' a lot, or i might flash the hazards for a blip, like trucks do when someone lets you over lol... Ive done a LOT of highway driving with em'.
I also tend to wave at other Minis because apparently a lot of them do wave..might as well play.
I also give the wave a lot because i usually signal and let the person let me in, versus these fucks who just cut in front of me and take the gap that i purposely leave between me and the car in front... those guys may get a finger and some brights. /rant