I've worked with Colm Tobin for a number of years now and when he asked me to illustrate his book I told him to f-off. Then I said I would be honoured to illustrate his first book and it would be a real pleasure and I'm sure a lot of fun to work on (which it was!) so then he told me to f-off.
It's a great read, really really funny book and I can't recommend it enough. So go on, buy it for the craic.
It can be purchased in all good book stores and here is a link to the Kindle version