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Do social engineering hacks count?
Back when I had a high-level tech job (for which I was severely underqualified), my team were given a decommissioned Linux server each to mess around with and develop on. I convinced one of my colleagues to let me log in to his server as root for a sec. Then I ran a quick shell one-liner that repeatedly kicked anyone that wasn't on my tty. He could log in, only to be logged right back out again.
Prank successful, I cancelled it fairly quickly.
Then I let him have a turn on my server. Gave him the username "root" and its password. He got a fake shell that kind of, sort of, worked like Bash, but he couldn't do much of anything.
If the quotes around "root" didn't give it away, I'd changed the uid 0 username to something else and "root" was just a regular user. (And a couple of the fake shell's commands would lie and say it was uid 0.)