microwave

a blonde walks into an electronic store and say's " i'd like to buy that tv please". the man replies, "sorry but we do not serve blondes". the blonde gets really upset and decides to go and dye her hair black. she walks into the shop the next day and say's " please could i buy that tv". the man say's " sorry but we don't serve blonds". the blonde say's " how did you know i was blonde". the man replie's " because that's a microwave."