Some email messages sent as chain letters may seem fairly harmless; for example, a grammar school student wishing to see how many people can receive his/her email for a science project, but they can grow exponentially and be hard to stop. Messages sometimes include phony promises from companies or wealthy individuals (such as Bill Gates) promising a monetary reward to everyone who receives the message. They may also be politically motivated, such as "Save the Scouts, forward this to as many friends as possible" or a warning that a popular TV or radio show may be forced off the air. Some, like the "Hawaiian Good Luck Totem", which has spread in thousands of forms, threaten users with bad luck if not forwarded.