My new entertainment as I stroll to and from work is to wave enthuisatically to strangers on the other side of the street. Usually, they sheepishly wave back with their faces mixed between confusion, deep thought as they try to remember my face, and the friendly greeting one gives when the fool waving to you is actually known by you. Most people indulge me by waving. Maybe its the suit. Maybe we all hope to have friends that excited to spot you from across the street. Once they wave I stop, smile, and continue on my way.
P.S. Random notes on people's cars are nice too. Leave things like "You have pretty hair". Regardless of whether you have seen that person. Or important notes meant for other people. like, "Please don't invade Poland".