And thats why Cirno is da Strongest :3

Y'know, by now I'd actually be surprised by a Cirno-gets-called-to-the-board joke where Cirno got the problem wrong.

Not as clever as the "base 9" gag from post #439608, but still funny. Let's hear it for unconventional thinking.

She really sets herself up for that one. Rather like that scene from Spongebob with the "psychiatrist" and the word association game.