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The professor holds up a glass of water in class and asks students to guess its weight. When the students provide guesses, the professor notes that he doesn't actually know the weight unless he measures it. He then asks what would happen if he held the glass up for longer periods of time - minutes, hours, days. While the glass's weight would not change, holding it for long periods would cause strain and pain in his arm. He tells the students that problems are like the glass of water - they may seem manageable at first but can become overwhelming if dwelled on for too long. The professor concludes by advising students to "put the glass down" at the end of each day to avoid stress and face challenges fresh