If you have a warm hand when you shake somebody’s hand, you immediately become a more desirable person to get along with.So rub your hands together befoure giving a handshake.

If you haven't slept well, tell your brain "I slept well". You will feel fresh. It works like miracle.

Want to know if someone is attentive or not? Repeat your sentence with a slight change in it. If he is listening either his facial expression will change or he will point out and question the part.