A blonde walks into a TV shop and asks to buy a
TV. But the clerk says that they don't sell TV's
to blondes. 

Thinking that to be strange, she walks out. About
an hour later she goes in again and asks to buy a
TV. Again the clerk says that they don't sell 
TV's to blondes. 

The blonde is getting pissed now, so she goes and
dyes her hair red and then walks into the TV 
store asking to buy a TV. But once again, the 
clerk says that they don't sell TV's to blondes.

"But how did you know I was a blonde," she asks. 
And the clerk says," We sell microwaves in this
store."