Today’s Dinosaur Comics was written by xkcd‘s Randall Munroe:

Ryan North, the author of Dinosaur Comics, has used philosophical/logical themes in his comic as well, e.g., the Twin Earth comic, or the Post Hoc Ergo Propter Hoc comic, or the one on pragmatism. This one is pretty funny, too.

Of course, you’ve all seen the xkcd comic on Gödel and Russell’s Paradox.