Yankee Blonde

Sally wasn’t just stupid, but dead-dumb solid-rock stupid.
She was also a blonde, so her smart friends tried an experiment.
You know the old joke where artificial intelligence is where you dye a blonde’s hair black?
Well, they tried it with Sally.
They made her take off her favorite ballcap, then she washed her hair and dyed it dark.
Sure enough, she wasn’t dumb anymore.
Not quite a genius, but certainly smarter than before.
When her hair was dry enough, she put her trusty New York Yankees cap back on.
And, sure enough, she was the same old moron again.