One year on the 31st of March, I took care to put a 6mm hex wrench in my pocket before setting out for work. After most people had gone home for the day, I went to the multi-purpose room and helped myself to a spare piece of cubicle wall. I carried it up to my boss's cube and installed it in place of the gap that formed the entrance.
The next morning, Mikel strode down the hall, cut a quick dogleg to the left and ran smack into the newly-installed barrier. I wasn't there to witness it, but he related the story to me later with a chuckle.
