Years ago I was doing some work in a jail and someone reported that an exhaust fan wasn't working so I proceeded up to the roof to check it. When I got to the guards tower there was no one there so I just climbed out onto the roof. While looking at the fan I hear someone yelling in my direction. The guard had returned to his tower and was telling me to stop what I was doing. Then he tells me to look over at the other tower and there's a guard looking down the scope of his rifle at me. Seems they thought I was an inmate trying to escape and this guy was ready to take me down.
