Greet the stranger with a "Hello," and wait for a reply. If he shows no interest or eye contact, you might want to talk to someone else.
Make some small talk. If the guy has replied to your greeting, then you can bring up other common topics, such as commenting on the weather or sports, or admiring something he is wearing. Engaging him on light topics gives you an opportunity to move toward deeper subjects.
Volunteer a personal detail. If the small talk has gone well and he hasn't looked away or tried to ignore you, you might give him some information on yourself, such as why you are in that particular location. Offering information on yourself lets him know that you're comfortable sharing information with him, making him more likely to return the favor.
Ask about him. Men like to talk about themselves, too, so find out what you can about him. Ask about his interests, hobbies, his job or any other information you'd like to find out. When talking to him about himself, listen more and interject when you hear interesting information. Giving him the spotlight increases your chances of seeing him again.
- Respect his space. If he does not want to talk, do not press the issue.