The Hollow Chocolate Bunnies of the Apocalypse by Robert Rankin
Jack leaves his home town and is making him way to the big city to find his fortune. The city he comes across is Toy City, where toys are alive and nursery rhyme characters are the upper class. What Jack doesn't realize is that Toy City's first serial killer is on the loose, killing nursery rhyme characters, starting with Humpty Dumpty. Jack is befriended by Eddie, a teddy bear detective, and the two set off to find out who the killer is.
I've read others compare Rankin to Terry Pratchett but he reminds me more of Christopher Moore or Jasper Fforde. The play on words and the jokes about the nursery rhymes are well thought out and quite funny. I really enjoyed the characters and the filler story. What I thought was a bit weaker was the mystery itself. When clues of the killer were being given I actually felt rather let down.
First Line: "'Once upon a time,' said the big fat farmer, 'it was all fields around here.'"