I got trapped in a goods lift at one of the colleges in North London, and it was nearly 3pm on a friday afternoon, and I really thought that I was stuck there for the weekend. I had rung the alarm bell, but it didn't work - fortunately I heard conversation on the next floor down and shouted for help. I was in there for hour and a quarter, and I was very glad to get out of there, and then hit all the rush hour traffic on the way home - I was not a happy bunny!!