Become a salesman. Open your own business. Try to be unique, have a skill that someone wants or needs. You'll need to work hard. Or you could play the lottery.
Win the lottery, or think of an invention/product/service that millions of people want. If you really cut expenses and work lots you'd be surprised how much money you can save.
In order to legally become rich quick, without any risks involved, go in for the business of Money Transfer Business or some such other service where daily return is assured on your investment.