If you live just down the street from a major stadium, cash in on the huge number of fans who troop past your door by selling the sorts of things people always need: bottles of water, cans of soda, snacks, or even umbrellas. Even if you don’t have a perfectly situated home, consider selling these items to motorists in the next traffic jam or to festival - or concert-goers in the parking lot of major events. Just be sure to check the laws of your state beforehand.