Three nuns passed every day through a street that led them
from Church to a Reformatory. They noticed a parrot that stood
at the entrance of a big residential house. Every time they
passed in front of that house, the bird would pronounce three
sequential colors.
One day, they heard, "Yellow, blue, black." One of the nuns
noticed that those colors perfectly matched the colors of their
underwear. She mentioned her discovery to the other two
nuns, but both were reluctant to believe that could be possible.
The next day, they all wore black underwear and passed in
front of the house, and very precisely the parrot spoke, "Black,
black, black." Hearing that, the three nuns were astonished!!.
One of the nuns spoke up: "Girls, tomorrow we are going to
trick that bird."
Saying that, she recommended that the next day, none of
them should wear any underwear under their vestments.
Respecting their agreement, next day they wore no underwear
and proceeded to pass in front of the parrot's house.
They peeked at the bird. At the beginning, the parrot looked a
bit puzzled. He swung back and forth on the cane he was
perched on.
Then, after a while, the Parrot spoke, "Straight, Straight, Curly!"