I love this post from Lesswrong:
Yes, it’s very silly, but it’s a great example of one of the things I like about the rationality community. Typical people have an observation, like, “People seem to be getting stupider” and then they start thinking of possible explanations of why it might be true. If they find some, they assume the belief is indeed true and explained. But when the rationalists make an observation, they actually invest a lot of effort into identifying all possible ways that it might be true and all possible ways that it might be false. They actually apply effort and creativity to the process of checking ways that they might be wrong. Doing a good job on this step doesn’t guarantee you’ll get the right answer, but it puts you way ahead of just about everyone else.