After almost 20 years Bill Watterson has officially drawn another comic strip. Pearls Before Swine artist Stephan Pastis was in the right place and the right time (and also had just published this strip) and the two collaborated briefly.
Stephan Pastis's wordpress website describes the encounter.
The comic strips:
(Score: 2) by tynin on Wednesday June 11 2014, @08:03PM
Yeah, I suppose it has been a while since those feelings really griped me. Over time, I got over it. It has been a LONG time now. But seeing him doing a couple of panels really drove it back up fresh. I usually have at least one of two of his books on my desk, though I don't think I could find them all now. Time fades everything.