You didn't know that? Only admins can permaban. Otherwise, a mod could lose his temper and start permabanning everyone for no reason. That's why only admins are trusted with that feature.
You mean IP ban?
I wonder how they'd get away with that. It would be hard to program a feature like that into the site, just for a one-day April Fools joke.
I "didn't exist" at that point, but I still doubt that they would create an IP ban and only use it on one person.
Easier than composing something new every year.
Well, I have some great ideas for pranks, but the admins would actually have to listen to me in order for them to work. And they'd take a long time, so it's too late for this year. :P