Came in and device I was automating a test against wasn't responding. 4 hours in co-worker asked why I was looking so pissed.

Me: Can't get any console input on $device.
Cw: Oh console might still be unplugged. I don't remember plugging it back in yesterday.
Me: ...why...
Cw: I don't know Linux and I locked myself out of console. I just went over and direct connected for a few min.

This is a reoccurring problem.