thats just wrong to mess with someones car.....what model m3 is it? e36 e46?? haha well if u dont care about how wrong it is the mess with someones car then take a piss in the vent between there hood and front windsheild....when they turn on the heat or even the air there whole car will smell like piss....i heard its really $$$ to get fixed...but still messing with a car is just wrong....just mess with him