Where does one start with this book? I'm not really sure what I just read myself. I doubt Adams really knew what he was writing. Abstract doesn't even begin to describe it. I'm not very clear on the ending, it's just so random, but infinitely funny and entertaining. I'm not usually a fan of such work, reminiscent of Pratchett, Christopher Moore and to some extent, Gaiman, but this book was so enjoyable. True, there really wasn't a plot or any point to it, but it was just funny, wild, intelligent and delightfully absurd. 
 Great job with the characters, especially Reg and Dirk. Witty dialogue, quirky characterizations, ridiculous events. A breath of fresh air really. 
 Recommended for fans of Pratchett, lovers of silliness, quantum theorists and time travellers.