Riffable Books?

[Dim of the Yard]

Riffing an entire book might be a tall order, but riffing parts of a book or stories or comic books are certainly possible and have been done on the Internet.  One of my favorite forums used to be for a site called Godawful Fanfiction that would do great MST3K style spoofs of fanfic.

The forums are back, actually.  You can find them here.  You have to register for an account to see the forums, but I think it's worth it.