Some books need a sequel but alas the authors were too selfish to bother writing them. Who would not, for example, love to read a sequel to War of the Worlds by H.G. Wells. I've also included spoofs and parodies of great SciFi novels.
Some classics can be a bit overbearing.
A good spoof helps keep the medicine down. Not actually a sequel but a parody for people who can't bring themselves to read the entire trilogy or need a light hearted and irreverent recap to wash the whole thing down. With characters like Frito, Dildo and Pepsi you can imagine the kind of humour you'll find here. If you revere Tolkien DO NOT read this book. If, on the other hand, you view Tolkien as a great writer but not some form of religious deity, then Bored of the Rings might give you some small amusement.