My First Interview @ KLA Tencor

[GD Topic: How big is letter M]
After waiting a long I got a chance to sit in interview of KLA Tencor that was giving package of Rs. 8 lack which was a huge package for any batti (electrical) guy in core field. I would try to present exact scenario of interview. I entered the room. I saw a tall, bald guy who looks like Raghu of Rodies.
(........ means some conversation that I'm not writing here.)
Me: Good afternoon sir.(in slow voice)
HR: What?
Me: Good afternoon sir.(in a little high pich)
HR: I didn't get you.
Me: Good afternoon sir.(loudly)
HR: Mr. Pankaj, please sit down. Tell me something about yourself.
Me: (I introduced myself as I learnt at OP time at 2nd year).
HR: What are your biggest achievement of you life?
Me: Clearing JEE and Internship at CERN.
HR: You have been to CERN. Tell me about that.
Me: (I told a lot and finally)........... I've got PHD offer as well from there. (My first mistake)
HR: Why don't you join PHD?
Me: .........I want to earn money. (My second mistake that was enough to filter me)
HR: (Then he asked about my family background for the rest of interview.)
This was just a 7-8 minute of interview of HR. Finally he shake hands saying that It's proud to meet someone who has been to CERN and we will meet tomorrow if you are selected.