The Misconception: You are a rational, logical being who sees the world as it really is.
The Truth: You are as deluded as the rest of us, but that's OK, it keeps you sane.
Imagine a scientist deals four cards out in front of you. Unlike normal playing cards, these have single numbers on one side and single colors on the other. You see a three, eight, red, and brown. If a card has an even number on one side then it must be red on the opposite side. Which card or cards must you flip to prove this is true?
When psychologist Peter Watson conducted this experiment in 1977, less than 10% of people asked got the correct answer.
The only answer is to turn over both the eight and the brown cards. If the other side of the eight is red, you confirm what you were told, but not proven if it can be broken. If the brown card has an odd number you learn nothing, but if it has an even number you have falsified the claims of the psychologist.