Street Vendors

In some tourist places in any part of the world, people will come up to you showing you the products they are trying to sell. And they will talk to you, to your face, as you walk by. Ignore them. And don't feel impolite for doing so either, 'cause they are often being impolite with how pushy they are as they try to get you to buy their stuff. Even if you are interested in what they have to sell, do not show interest, and always be willing to walk away if their prices are too high. They need your business more than you need theirs.