Many years ago while in service I hitched a ride on an USAF C-47. The Pilot came aft to have smoke and relieve himself. He noticed that I had an aviation rate and asked if I would like to go forward and sit in the left-hand seat. I went forward and sat down and buckled up and noticed that the co-pilot was a second lieutenant most likely just out of flight school as he didn’t look any older that me. He lit up a cigarette and before taking the first puff the engines started running rough. He had forgotten to switch fuel tanks. He took a long drag on the cigarette and started reaching for the fuel selector valves which were located on the cockpit floor next to his seat. He switched tanks and every thing returned to normal. And then he exhaled filling the small cockpit area with smoke. The cigarette was one half ash.
