What is your job? Closing the window instead of clicking cancel to see what breaks?
I choose this example, because my first "professional" software was some data logging code I wrote for a little electronics assembly team I was on and I hated the usesless redundant data entry so I wrote a program that saved days of effort per week.
My first experience handing it off to a user uncovered a bug because I had something like a "accept, cancel" dialog and it never occurred to me that when presented two options the person might just close the dialog without picking either.
