Blonde Jokes - Electronics Store

A blonde walks into an electronics store asks a helper if he can buy a tv he sees on a shelf.
The helper then says no we dont sell tvs to blonds.
The next day he trys to buy the tv on the shelf but he got the same reply.
So the next day he dyes his hair black and asks for the tv on the shelf.
The helper still says no we dont sell tvs to blondes.
The blonde then asks how do you know im blond
The helper then says because its a microwave not a tv.