Non-Obvious and Counterintuitive
I knew a professor of psychology who was told by one of his professors that there are two general responses to findings in psychology: "That's obvious" and "That can't really be true." I think the classic can't-be-true experiment is the one on cognitive dissonance. Now comes an article in The Psychologist about other non-obvious findings in psychology and why they are non-obvious in the first place.