Fans of the Attack on Titan manga have discovered that while the in-world text appears to be gibberish, it's actually pretty easy to decipher. All you have to do is flip the page upside-down, and voilà, a message appears in sloppily-scrawled katakana.
What it reveals, though, isn't exactly illuminating. No, there aren't any hints about the origins of the titans or what's in the basement, but it does give you a strange glimpse inside the mind of mangaka Hajime Isayama.
The translation is a little unsafe for work, so highlight the paragraph below if you want to see it.
[Rock scissors paper, rock scissors paper, rock scissors paper
So, what should I make, what should I make
In my right hand, a wiener, in my left hand, a pussy
Raw barley, raw rice, raw eggs
Talking dirty all day, all right!]
Maybe an eager fan will track down the rest of the letters in the series and see whether or not Isayama decided on barley or rice.