Morty - One never fails at an interview. Either the job is a good match for you or it's not. You'll still be the same Morty with the hipflask either way.

More advice: Arrive at the interview early enough to check out the place. I went on one, arrived a half hour early to discover a nasty scene in the company cafeteria. The owner hadn't been paying his factory workers if they broke any rules - you were late this morning, NO PAY FOR YOU! I left before the riot broke out. But you can learn a lot about a company by sitting in the reception area or touching up your make-up in the Ladies Room. Get a feel for the whole "tone" of the place.