A crushing handshake is a good way of sending a message that you can always deny later. I did that with a contractor once who was trying to fuck me in a meeting with my client. During the phony end-of-the-meeting handshakes, I just kept squeezing harder and wouldn't let go, looked him straight in the eye and said "We'll talk soon". By the time I got back to the office, contractor boy's daddy had called the owner of my firm and wanted to have a meeting to discuss it. Unbelievable. When I told the boss that I was just trying to protect his interests, he could barely keep from laughing, slapped me on the back and told me not to pull that kind of shit again. THAT is the kind of guy I want to work for.