Taxi drivers

I try to give one of them a tip today for going out of his way to the shop on my way home so I could pick up some doritos (I haven't had them in a long time and I suddenly have a mad urge for them 0_o) and he doesn't accept it, so I just hand him the cash and run out of the car and he CHASES AFTER ME all the way to my house to give me it back. Bastard.