Ah, the story of the Ratzeputz-encounter.
I woke up on a concrete floor, wearing a white shirt with a tie, black pants, and my formal shoes. The room was large, and had an industrial feel to it. I looked around and spotted a service-elevator. On the other side of the wall I saw a bucket with paint, and some paint-rollers. When I looked outside the dusty window, I gathered I must have been on the 3rd floor.
A voice said "hello"... I said: "hello?". A big man, looking eastern-europe like, was standing over me. He looked annoyed. I looked back at him, confused. I stood up and he walked down the stairs, and I could hear him enter a door when he reached the bottom.
I followed his route and found two doors, one of which led to the outside. It was locked. I tried turning the lock. I then tried opening the door again... still locked. I felt the panic rush over me. Had I been kidnapped?
A number was written on a sticker. It was the number to "Securitas". I found my phone, to my surprise. Would a kidnapper leave phone? I dialed the number. After a confusing conversation with a well-meaning man, I hung up. He couldn't help me open it. Shortly after, the eastern-european man returned.
He didn't look at me, but he walked up to the large door, turned the key WHILST turning the handle. The door opened, and he reached out and grabbed a broom. Before it closed I jammed my hand in the door, jumped out, and ran for my life. But the man went back inside. He didn't care. I was safe.
I saw a street sign, naming the most dangerous street in my city. I walked a few feet and onto the street. When I turned around I noticed an unknown pub, neighboring the building I had woken up in. A few flashes went through my head, and I thought I might have visited that pub the night before. And... had I ordered shots?
Oh, yes. I remembered! I had ordered a shot of ratzeputz. And one second later, I woke up. Only, it wasn't one second. It had been 9 hours!
I never remembered what happened in those lost hours. So I said my prayers, swore never to drink again. And then... I walked home.
TL;DR: Woke up on a concrete floor, to hungover/stupid to open the door to the outside, barely escaped with my life intact.