Butter isn't just good for topping toast and popcorn. There are plenty of other things it is useful for, such as:
Swallowing pills: Coat the pills with a thin layer of butter to make them go down easier, especially bigger pills and ones that have no coating.
De-stress cats: If you're moving or throwing a party, your cat can get a bit stressed by the sudden change in the environment. Put a little dab of butter on the top of her paws. She'll be distracted by cleaning herself.
Prevent cheese mold: Put a thin coat of butter on the cheese after you cut it so it won't get too hard or start molding, especially harder cheeses.
Preserve onions: If you cut an onion in half and decide to leave the other half in the fridge, coat the exposed side with a bit of butter to keep it fresh longer.