I read this in an issue of Air Force Magazine that I found lying around somewhere, many years ago. It was written by a WWII US pilot who had been captured during the war and interrogated by him. He looked the guy up for an interview.

Since the guy assured him he never released a pilot until he found out something he didn't already know. The pilot asked him, "What did you get from me?" He replied,
"Oh, I did so many, I couldn't possibly remember".