Can you eat any F'ing louder?

There is a guy at work who sits about 10 feet from me. I have never heard anyone eat so loud in my life. Now this is a pet peeve of mine, but I am not the only person to comment on how annoyingly loud he eats.

He chews every single bite with his mouth open...and he eats allot! Especially chips!

I have tried joking with him about it and he didn't get the hint.

So help me please! How do I get him to chew with his mouth closed? If I don't find a solution soon I am afraid I am going to go postal!