Sth. really interesting & of course useful:
How to be interesting without saying a word:

Have you ever looked at someone and just felt that they were an interesting person?
The answer is yes. So listen! :)

There are two aspects to communication: verbal and non-verbal communication.
Here I'm talking about non-verbal communication, also known as body language. If you want to appear attractive, then your body language has the power to communicate that. If you want to appear lazy, boring, or unattractive, then you adjust your body language accordingly and others will immediately begin judging you as lazy, boring, or unattractive. Your body language has the power to influence and communicate what you want – in our case, how to be interesting.

There are 3 simple but powerful body language tricks to make yourself appear more interesting :D but don't forget: You should practice!

1. Gooey Eyes

Eyes have always been important to humans. Without eyes, human communication relies on sounds. Without good eye contact, communication can be destroyed. Excellent eye contact is powerful in giving the message that you are an interesting person.

How?
Look at the person as per normal, but keep the eye contact going a little longer than you normally would. Just before you turn your head down, to the side or to someone else’s eyes to break the eye contact, maintain eye contact for a bit longer by peeling your gooey eyes off the person as you turn your head. Peel your eyes off the person like a sticky toffee being lifted from the surface.

It shows the person you are confident enough to make strong contact. The technique also communicates that the person has something about them that other people do not see!

If you are a guy and want to appear attractive to a lady, make an effort to never look away from her until she loses eye contact with you. Women love slow, meaningful body language.

2. Illuminating Smile

Most of us are well aware of a good smile’s influence, yet many people wonder how a good smile is done.
Seeing only a smile makes you feel better. Likewise, seeing a person frown makes you feel worse. It is a magical brain-to-brain connection that links humans in an almost mystical way. You can make people feel good, make yourself feel good, and make yourself look good by cultivating an illuminating smile.

But how to smile well? If you can build positive emotions inside yourself, a true smile will show on the outside.
After one second of good eye contact with someone, “turn up” your smile. Begin with a little smile, slowly increasing it over two seconds until it becomes a big smile. So, from the initial eye contact to your largest smile will total about three seconds.

3.Capitalizing Posture

A good posture is often associated with being tall, high status, strong confidence, and power. A capitalizing posture will be like buildings in a capital city. This doesn’t mean you need to be like a giant (me :)) to have good posture. Far from it. It is about focusing on being erect and using your posture the best you can. It’s time to put an end to having a posture that is more like The Leaning Tower of Pisa than a strong, stable structure.

All you need to do is lift your chest up. That’s it! Your head will rise, your neck will straighten, your shoulders will drop back, and your back will straighten – all by lifting your chest! This is a capitalizing posture.