Because the sheep have gotten used to the sound of zippers
U and I.
Papal towels.
Open Toad sandals...
Space Jammies!
Sssssssss....
He called the piano tuna!
They saw what happened to the sheep
Hey! Ewe!
Arak of lamb
Hey look, we have the same IPhone case
Because a sheep can hear a zipper from a mile away.
My zipper.
Look under his kilt and if he has a quarter pounder then he is a McDonald.