Quote by Mr. Krabs (Episode 56a)

SpongeBob: "But, Mr. Krabs, I found that under the grill."
Mr. Krabs: "And tomorrow a customer will find it under his bun."
SpongeBob: "But it's old and cold and so very full of mold."
Mr. Krabs: "You're not to make another patty until that one is sold. Understand?"