when i had my E46 M3 , this guy with a CSL drives past me and revs the car, so i follow him onto the highway on ramp and chase ... the CSL of course slowly starts to pull away from me and after the short litte race we next to each other give a thumbs up a smile and a hoot and we part our ways ... my GF was in the car with me and she asked "do you know that guy?" ... i said: "no" ... she then replied "do you guys have some sort of secret BMW society?" ... well i guess so ... perks of having a bee-em ...
A bit off topic : Was driving my sisters bug convertible and theres these three guys that were fighting and swearing each other on the side of the road ... as i drove past the one nudged the other to check the bug out ... and they were all smiles and happy again ... found that really amazing ...