The definition of an inanity is a lack of sense, significance, or ideas; silliness. That's all you will find here.
I love your Grammar Cat cartoons! If I may be so bold, though, there's a grammatical error in the "Who vs. Whom" one: the final panel should read "...the box that..." rather than "...the box which..."http://grammar.quickanddirtytips.com/which-versus-that.aspx
I love this stuff! I am totally snagging some for some class powerpoints (credit given I promise)! http://eslcarissa.blogspot.com