"The TV" joke

The dumb-blonde went into a store and said to the manager, "
I'd like to buy one of your TVs"
. The manager said,"
I dont sell my items to dumb-blondes"
. So, she bought a wig that had brown hair and went back in. She said "
I'd like to buy one of your TVs"
. But, he said the same thing he did before. Then, she put on a wig with a new color hair, red. She went back in and said"
I'd like to buy one of your TVs"
. The manager replied, "
I dont sell my items to dumb-blondes."
. Just then, she took her wig off and said, "
how did you know I was a dumb-blonde when I had my wig on?"
. And the manager said, "
those aren't TVs, they are microwaves!!"