When the person is a stranger, look at them, make eye contact, smile and look away. Look back again, smile, and hold their gaze for a bit longer than the first time. They should come right over! If they are too shy, just say hello, and introduce yourself. Don't start out with "what do you do?" or any other cliches. Even compliment someone on something specific, and make it genuine!
This tip was submitted by an anonymous visitor to our website.