I think I got a job offer based on confidence alone

(Nathan For You fans will understand the confidence reference)

So, I received a job offer this morning!
Let me tell you the whole story so you can appreciate how crazy this is.

I had an interview last week. I felt awesome, I looked awesome. I was SO prepared. My mom came over to watch the girls and she was so impressed with how calm and confident I was, she even asked me if I'd been drinking.  Got there Ok, time to spare. Walked around downtown Toronto for a bit. Found my way to the interview room (and saw two of my old colleagues along the way! crazy!). I walked in. I was confident. I shook hands. I was confident. I KNEW I was fully prepared -- I'd studied and rehearsed this interview in my head for almost two weeks. 

Then, the ONLY questions they asked me were about my commute and really, really specific technical questions regarding the equipment I'd be running. I knew not ONE single answer. It was horrible. I looked, and felt like a complete idiot. I've honestly never felt so inadequately prepared for any type of academic exam/questions before in my entire life. 

I was actually pretty OK with the entire thing afterwards because I figured it just wasn't the job for me and the hiring manager mentioned that he'd put my resume in the top of the pile for another job I'd applied for -- but that THIS job really was the better job. 

Then, this morning, he called me. 
His very first question this morning was to ask how I felt I did in the interview and I was completely honest -- said what I did above. And, HE AGREED WITH ME! He told me he'd give me a D on my interview questions.

But here's the craziest part.. they're offering me the job anyway. For the job I'd interviewed for! And all because I was enthusiastic, I had great soft skills, and my references spoke so highly of me! 

I sort of hesitated to post this all since I haven't actually signed anything yet, but I'm sort of also really excited and I've already told everyone I'm related to.