2 years old.
Cow: "Mooooove over"
Sheep: "Naaaaaaa."
or
When it's going cheep!
Did you hear the one about the crow and the telephone pole?
He wanted to make a long distance caw.
or
At the hickory dickory dock.
or
"Ten billion dollars and high cholesterol!"
or
it was Wedgie Kray.
or