Grand Theft Auto 4 Easter Egg - Chuck Norris References

In the bohan safehouse is a book called "Madness and Blasphermy The Do's and Dont's" already mentioned by some else, but if you shoot the book on top you can see the book was written by 'nuck chorris' a reference to 'chuck norris'

Also go to any Cluckin' Bell and find a plastic covering with a man in a chicken suit inside of it. read the label. It says free "Cluck Norris" toy with every meal