Times were tough for finding employment as an engineer, so Bill decided to look further afield. He saw an ad for an accountant and thought "I'm good with numbers - I'll apply."
When he got to the interview, he was dismayed to see the waiting area full of other engineers with the same idea. He went through the interview and answered all the questions. As he was leaving, the interviewer asked him "Quick. What's 3 x 7?" Bill panicked. He didn't have his HP programmable calculator with him! With great fear, he answered "22".
As soon as he got home, he grabbed his faithful HP and realized he'd given the wrong answer. He was gutted. And then, he was astonished when he got a call offering him the job. He hesitantly asked "What about the 3 x 7 question?"
The interviewer told him "Your answer was the closest!"