I went for an interview in Redmond, for which the recruiting agency had clearly 'oversold' the job description (I should have known better, too) - it was billed as more of a PM position than what it was - line / UAT testing.
Anyway, I got into the interviews, and I could sense something was up. I was answering the questions but they didn't seem... enthusiastic... about them, or me. I like to think I usually interview decently, though of course I can improve.
Eventually someone says, "Hmm, can you wait here a minute?" and a new person comes in with him a few moments later.
"So... I'm not sure why the agency sent you to us." Okay...? "You're definitely over-qualified for this role, and frankly we think you'd be bored." I thought it was a good opportunity to get in the door (and MSFT is a great place to work), so I tried to offer a little placation, when he introduced the other person, "But I know that [name] here has been looking for a PM, so why don't you talk to her."
I walked out that afternoon with a different, better, higher paying job, because someone thought "outside the box".