Chris,
You forgot to mention a cellphone! One time we climbed up on the roof of a 27 story building and a gust of wind came along and slammed the door shut of the stairwell and it locked. We called the building management office about 3 or 4 times and the receptionist thought we were prank callers and kept hanging up on us
Another word to the wise, be careful when using elevators. I had one crap out on me one time and left me stranded between the 13th and 14th floor. The only way out was to climb the ladder to the elevator penthouse (25th floor) and then walk down the steps. Those ladders are al covered with grease