Garfield gets very sentimental around Christmas. In one strip, he was asked what he wants for Christmas, and responds by saying that he wants a "second helping" of the food, shelter and love he already has.
And earlier, when Jon stumbles in on Liz's date with some other guy. The other guy asks something along the lines of "What, do you like this idiot?" and, not missing a beat, Liz says "As a matter of fact, I do".
This. A more subtle example, and Your Mileage May Vary, but considering Jon's life, it's quite a heavy-hitter.