“Never try to look into both eyes at the same time. Switch your gaze from one eye to the other. That signals warmth and sincerity.” - Dorothy Sarnoff

And don't look straight into the eyes of a dog. This can be a risky thing to do. Dogs don't seem to like this much.

Signal Flagstaff in Urunga

Quote by  http://thinkexist.com/quotes/with/keyword/signals/2.html
Image by Mezza - Flagstaff Hill in Urunga