It is possible to tell things by a handshake. I like the "looking in the eye" syndrome. It conveys interest. I like the firm, though not bone crushing shake. The bone crusher is trying too hard to "macho it.: The clammy or diffident handshake — fairly or unfairly — get me off to a bad start with a person.
Letter to Gary Hanauser (18 September 1979), as quoted in All the Best, George Bush : My Life in Letters and Other Writings (2000), p. 282