Back when I was into MMOs, there was this very entertaining blog called Bannable Offenses by a "GM Dave" who would tell stories of abusing his GM powers in FFXI.
Some of my favorite posts include him warping a cheater to a boss and killing her over and over, deleveling her some 20 levels (a significant amount of work to lose in Final Fantasy XI). That's the very first post:
http://bannable-offenses.blogspot.com/2006_04_01_archive.html
(Can't link individual posts directly, scroll down to see the first post.)
I was really sad when he suddenly stopped five years ago with a post talking about how he was back.
