I bought an old Sparcstation at university auction. After gaining access found one of my professor's account. It was his workstation. Had a chuckle, wiped it, and installed FreeBSD.
Some years ago I got a workstation (either a VAXstation or MIPS DECstation) that originally belonged to a university group where my then-boss had studied. Since the OS was old enough to have used the original weak crypt(3) for /etc/passwd, I checked… and yes, he did still use the same password.
(I wiped it and installed NetBSD.)