Last one to post in this thread wins!

Last week a customer of mine came to me and said I spilled coffee on my limestone hearth and it stained, can you fix it I said I’ll see what I can do. Tried a poltice tried sanding nothing. Sat there on the hearth looking at the stain. Then it hit me, went to his kitchen made a pot of coffee stained whole hearth. He thanked me and asked what do I owe you. I said on the house.