Old MacPumpkin had a farm

Old MacPumpkin had a farm. Eek! Ahh! Eek! Ahh! Ohhh! And on that farm she had - a cat, a bat, a spider, a skeleton, a witch, a ghost and a MONSTER! Old MacPumpkin is too busy taking care of the farm animals to notice, until - Knock! Knock! Who's that at the door?