do you know

a man is driving thru' a road that's placed in spiral-shape around a high mountain and as there is seen no other one in the road, nor close to it, he's doing it at a high speed when thru' the mirror he seees a motorbyke approaching really fast and the cycle goes close to him and the biker shouts
-hey, do you know the new bike ray 1500?
the car driver keeps silence and thinks 'I know the bike, indeed, I work in a store specialized in selling bikes, and I sell a ray most every week' however in anger becauseof the attitude of the biker he presses the accelerator and sees the fugitive, reachs him and leaves him behind, then the guy relaxs and says
-from now on just peace and tranquility!
at that point in the mirror appears again the byke but this time faster and when side by side the biker says:
-hey, do you know the new bike ray 1500?
the car driver presses higher the accelerator but the curve is much too close and he has no time to make it and he falls followed by the motorbyke and again when side by side the guy in the byke says:
-hey, do you know the new bike ray 1500?
this time the car driver answers:
-sure, dude, I work selling that stuff
-then, can you be so gentle to tell me where the hell it has the brakes?