Business Description: Instead of saying "If I had a dime everytime I heard that, I'd be rich" you should actually start charging people a dime every time they say it. This will get you some money, and will get people to stop saying stupid stuff around you.
Business Competitors: I don't think many people are actually working in this business, so competition will be low. Don't be afraid to charge more, up to a quarter.
Related Business Idea: If someone says "A penny for your thoughts," always take it. This should be a no-brainer
Other Related Business Idea: If someone says "here's my two cents," demand that they give you two cents.