I remember my high school AP Psychology teacher mocking p=0.05 as practically meaningless. In retrospect it's funny for a psychologist to say that, but I guess it was because he was from the more empirically minded behaviorist cognitive school and from time to time they have done actual rigorous experiments[1] (in rodents).
[1] For example as described by Feynman in Cargo Cult Science.
[1] For example as described by Feynman in Cargo Cult Science.