It was at a company that had two separate offices in the city, about a ten minute walk from each other. I get to the place where the interview is supposed to be, about 15 minutes early because I wanted to make a good impression, only to be told by the lady in the front desk that the interview was in the other building. I got out the letter confirming my interview (showing how long ago this was, haha), and showed it to the lady, and it said in there that I had to report to the building that I was in. And she said words to the effect of "Yeah, you report in here, but the actual interview is in the other office." So I thanked her, confirmed whereabouts in the other building I needed to go, then just went to the pub instead.
I'm still not sure if it was deliberate mindgames to see how people dealt with stress, a way of weaning out people who didn't have "good" timekeeping (since being just ten minutes early or less would mean that you'd actually end up being late for the real interview), or if they were just idiots, but it was only for a temp job, I had another job lined up that was due to start a couple of months later, and I was still living with my parents having zero real responsibilities, so I just figured fuck 'em.
I had an interview where they didn't directly give me an address, I just googled the office. I got there and there was nothing there. I frantically regoogled them and found another address, 15 minutes away, listed on their website than what was on google maps and rushed over there. Thankfully I was trying to be early as well. They asked me if I had any trouble getting there. Apparently they had moved offices a while back and never updated google maps.