So.... Here's an interesting premise. You know the Garfield comic strips? What if the cat Garfield is completely in Jon's imagination? What if Garfield doesn't really exist at all and Jon is talking to an imaginary cat the whole time? What would that make Jon? A COMPLETELY INSANE, LONELY LOSER - THAT'S WHAT! And you know what? I'm okay with that. Because it's very slyly funny! (isn't "slyly" a weird word?)
To achieve this effect the creators of http://garfieldminusgarfield.net/ Garfield Minus Garfield simply digitally remove the character Garfield and all of Garfield's word balloons from the comic strips. What's left? Crazy Jon. The concept is funnier in large doses.
Check out the samples below: