Coleman used to start his field theory course saying this
Sidney Coleman
Quote of the day
Some women can be fooled all of the time, and all women can be fooled some of the time, but the same woman can't be fooled by the same man in the same way more than half of the time.
Bio: Sidney Richard Coleman was an American theoretical physicist who studied under Murray Gell-Mann. He is notable for his research in high-energy theoretical physics.