At an informal gathering, my colleagues and I started talking about our experiences being interviewed at Microsoft. One of the people there remembered how one of the pieces of feedback on the interview lo these many years ago was that although my colleague was certainly smart enough and hardworking enough, there seemed to be insufficient enthusiasm for the subject matter. I mean, my colleague cared about the subject matter but apparently didn't care enough to satisfy the interviewer. The offer was extended despite this reservation, and my colleague joined the team. Years passed, and the details of the encounter were largely forgotten. Microsoft is a large company, and the group you end up assigned to may not have any members from your original interview loop.
The assessment of my colleague as insufficiently enthusiastic was ironic since this particular informal gathering took place at the PDC. If you're speaking at the PDC, then presumably you're not totally disinterested in the material.
Upon completion of this story, another colleague spoke up. "Hey wait, I think I was that interviewer!"