My first test drive in an M3 (later my M3), the salesman was new and did not know what it did. I came back after I bought the car and let him experience what it does. (On a quiet piece of good road). I think his eyes bugged out when the car took off and I redlined it in 3 gears and then slammed on the brakes at "far too fast for in the city".
The Sports Button: a simple switch that turns a nice seemingly sedate sports car into a fire breathing monster. (in an M)