There was the segment that went down because a guy disconnected his computer and, thinking he was helping, plugged the resulting open plug with a F-F coupler and a terminator. Fortunately he had the sense to fess up when he heard us coming and fortunately I had the sense not to blow him off because we were too busy to talk to him just then. (I didn't know it was relevant until I talked to him, understand.)
Palm over face, I explained that the cabling was not a water pipe and didn't need to be capped off to keep the elections in.
Ignorance rather than stupidity and he came to us so we let him off without a lynching. He had the grace to be deeply chagrined.