I know of a chap, called Terry, who became known as Total Network Terry. TNT. Because he accidently plugged the wrong cable into the wrong jack in the wrong cable cupboard on the wrong floor.
Just finding it took days to sort out, apparently.
That's like when I unplugged what I thought was our T1 line, but it turned out it was a neighbor's, who happened to be an ISP, which was a new business direction we were just moving into. And they didn't believe it was an accident...
Just finding it took days to sort out, apparently.