[tyingq]

The stories seem to be going backwards in time, so I'll chain my 80's version of this. I wrote a fake login prompt on our VAX that looked exactly like the normal login prompt on the VT100 terminals. It would record the userid and password in a log file, give the "wrong password" message, then exit/logout so the real prompt was there for their second try.

I'd launch that on a few terminals on my way out of the lab.

Never did anything notable with it, but didn't get caught either.

I believe this sort of thing is the primary reason for needing to ctl-alt-del to login to windows. Though I'll bet most people wouldn't think much of a (fake) login screen just being there ready to go...they'd probably try to login anyway.