If that looking glass get's broke Momma's gonna buy you a Billy goat

If that Billy goat wont pull, Momma's gonna buy you a cart and bull

If that cart and bull turn over, Mama's gonna buy you a dog named Rover.

If that dog named Rover don't bark,Mama's gonna buy you a horse and cart.

If that horse and cart fall down,You'll still be the sweetest little baby in town.

(needed another line and a couple others rearranged...I think this is close to the orig., although, we always sang "papa"