Often famous or well known people have said something important, funny, thought provoking, ridiculous, or a sentence that simply makes no sense at all. Then over time others will use what they said when they talk or write.
Do you have a quote or saying you know or like? Maybe your parents or grandparents use one? If not, see if you can find one and tell us why you picked it. Don't forget to think about cartoon characters as well. Sometimes they come up with some real crack-ups!
One of my favourites.