Way the heck back when I was in retail, we had a system that allowed a marquee text, displayed out front, to be changed with a simple GUI. This store had an idiot manager at the time, who decided that in order to turn it off, all he had to do was uninstall all of the control and driver software from the computer, and when that didn't work, pull a bunch of hopefully-Ethernet cables out of the wall.
Every time I'm in that area, the sign is still there, with the same dang (hideously outdated) message. He's long gone too, and no one can apparently figure out what he did.
I mean come on guys, at least put some masking tape over it.