My dad's a large animal vet, and his best phrase is probably "The ratio of horses to horse's asses in this world is not equal." Also, whenever my brother or I were hurt or sick, he'd offer to go get something out of the truck. And his parenting motto is "Boys will commit random acts of stupidity."
My mom and I are in the habit of telling my adopted brother that we do still have the receipt, and that he cost less than the car.