When I was in school I showed my algorithm(on paper) to my teacher and He said: "It's wrong". I strongly said: "It works!". He froze for few seconds and than sa

When I was in school I showed my algorithm(on paper) to my teacher and He said: "It's wrong". I strongly said: "It works!". He froze for few seconds and than said: "Use these data for inputs" and I immediately saw the bug. Of course the entire class laughed. I know that The story isn't about debugging, but sometimes showing "right" inputs can be very efficient way how to explain the bug to other person.