mxyzplk is - and has been for a long while - a very active user and moderator. Ever since I've started reading RPG.SE, every time I visited the site, I've seen his signature on post after post, either providing quality content or helpful moderation.
However, one thing I couldn't figure out was: why did he choose such a bizzare avatar?
It was really odd, and didn't fit the theme of the site.
And then I would click on his avatar,
and all would become clear. What I was seeing
wasn't quite the thing that everyone else was seeing.
(As in, it's not a misshapen, shrugging, single-toothed Looney-Tunes-style gold-digger.)
And to this day, this optical correction keeps haunting me.