I sort of know what he means. In the summer my friend Anton told me about this book for the first time and I thought he was on drugs. A graphic novel, about a talking tube train, with a subplot about a fat comedian, and series of grisly murders, by fat comedian Alexei Sayle!!!???.
It sounded too good (or too mad) to be true. A quick search on net and I found that the book really existed but was out of print - D'OH. However, I got a couple of second hand copies through abebooks.co.uk or abebooks.com, or Amazon.
It's a fantastic book for people who like reading about London, tube humour, commuter humour, Alexi Sayle, graphic novels, cartoons, serial killers, Thomas the Tank Engine or the idea of talking tube trains.