Blonde at a store

The blonde walks into a store and askes the clerk if she could buy the T.V. on the shelf. He said," No, i dont sell to blondes." So the blonde goes home and dies her hair Blue. When she gets back to the store she askes the clerk agian if she could buy the T.V. on the shelf. He replies" No, I dont sell to blondes." So she goes home one more time and dies her hair red. This time she asked the clerk if she could buy the t.v. on the shelf. He said "No , I dont sell to blondes." then she says "How do you know I am a blonde?" He said " Because that is not a t.v. it is a microwave."