If you dump bacon grease, frying oil, or other fatty substances down the kitchen sink, prepare to pay a professional to unclog your drainpipes. Grease coagulates as it cools, and once in your pipes, that solidified fat results in heavy clogs that can back up your house's plumbing. Instead of sending fat drippings down the drain, be smart. Set the grease aside to cool. Then scrape it in a non-recyclable container and put it in the garbage where it belongs.