Make a website where people can order weather (e.g. Good Weather in London on March 2nd from 13:00 to 15:00). To be trustworthy, make sure people can get the money back if they do not get what you promise.
Get an AmericanExpress gold card and buy 51% of the American Express shares using it. Then, don't send yourself a bill.
Sell guaranteed random bits over the internet. You can also give money back guarantee.