Did you have an "Aha!" moment?

How do you know when you know?

Did you have an “Aha!” moment that made you want to change careers? When?

Yes, two of them. I had often thought about it as a student, and when consulting firms did the rounds of campus recruiting, I went to their sessions and applied to a few places. They always said they welcomed applications from all fields, but I received no response (other than that…