One of our projects at military leadership school called for us to speak in front of the class on a topic picked by our instructor. A classmate gave an impassioned speech on the benefits of drinking liquor. Alcohol, he insisted, warded off colds, kept you alert, and even made you steadier on your feet.
"Good job," said our instructor when he finished. "Only one thing: Your topic was the benefits of drinking liquids, not liquor."