About the off the wall suggestions...here is a couple...
1-Go to a public place and make a "handshake evaluation stand". Here you ask people to give you handshakes so you can evaluate them.
when people asks you why you are doing this, say a made up statistic (or a real one if you find one) about how a good handshake can affect your business carreer.
After you receive the handshake, take notes and say loudly things like: "firm grip, but avoids eye contact", "too strong", "long enough", "too short", etc....
Then give them a piece of paper with a mark, (maybe from 1 to 10) and give them feedback about how a proper handshake must be.
2-Go to a public place and bring a chess board, or a deck of cards, or any relatively simple board game, like UNO for example. Ask people for a match. If you are feeling specially daring, challenge them.
Hope this helps. 