During the Air Force Academy's basic cadet training, the new cadets, known as doolies, go through a ten-day encampment outdoors. Prior to being served in the chow tent, they are required to do pullups and then get in line to answer questions about the academy. If they answer correctly, they are allowed to proceed inside. If not, they are sent to the back of the line.
One doolie had been sent back a number of times because he didn't reel off the answers. When the poor cadet came up again, a sympathetic upperclassman asked him, "What does the abbreviation S. I. D. N. K. stand for?"
The doolie bowed his head and replied, "Sir, I do not know."
"Right!" the upperclassman said. "Go on in there and get some chow!"