Funny Blonde Joke

a blonde walks into a store and asks, may I buy that tv, the store salesman say, sorry, we don't serve blondes. she comes the next day with her hair dyed black, and asks the same guy, can I buy this tv. the salesman says, sorry, we don't serve blondes. frustrated, the next day she dyes her hair red and to make sure, she asks a different salesman, can I buy this tv. he says, sorry, we don't serve blondes. the blonde says, how on earth did u know I was blonde. the salesman says, that's a microwave