2 years old.
Cow: "Mooooove over"
Sheep: "Naaaaaaa."
or
"The erection is rigged!"
or
When the spider spied her!
or
Because pepper makes them sneeze
or
Just one, provided there is a programmer around to explain how to do it.
or
A whole synod. One to move that the bulb be changed while the others debate until the room spins.
or