Among the Awesomenes that is the Pentakill Video, Can We Talk About...
The hidden jokes and maybe(?) teasers in the Karthus's songbook? I found some of them pretty funny. First we have Karthus's To-Do list, which I think the contents of speak for themselves. http://imgur.com/gallery/3HOau
Next we have a list of past and present items, and those which have been removed from the game have been crossed off, guess he's not done taking items yet. http://imgur.com/gallery/iYQQz
And finally we have this photo of one extremely weird looking guy and a shadow man wreathed in flame. I personally think at least one of these could be a new champion teaser, or another joke about potentially some champions that got axed in development. Out of either of them, the Shadow seems more likely as a Champion, considering it appears twice in the book, and in general just looks more like something they would add to the game then the other bearded horned smoking caterpillar thing. http://imgur.com/gallery/OZjwx
Thoughts?