Since 1976, Leo Baxendale's first Willy The Kid Book has gone mostly unchallenged as being amongst the funniest books ever written, and I say that completely without hyperbole. Filled with trained goldfish, vampire cows, plenty of Daleks, a family of Loch Mess Monsters, a Nazi witch, progressive attitudes toward racism, leering snowmen, hidden cunts, demonic bus drivers, a dwindling zoo staff, anally-violated elephants, King Kong, flying teeth, and enough background jokes to keep you reading and re-reading for years... It really ought to be a staple part of ANYONE's bookshelf.
And of course, it being an annual, there's a Christmassy story in it too - a proper "festive spirit" one too - presented below for all to see. Enjoy the festivities if you're of the sort that likes to do that kind of thing...

