"Bummer of a birthmark, Hal'" was my fave Farside. Can't find a picture though.
Gary Larson - very much not a twat.
Part of me disagrees, especially when he states:
These cartoons are my “children,” of sorts, and like a parent, I’m concerned about where they go at night without telling me. And, seeing them at someone’s web site is like getting the call at 2:00 a.m. that goes, “Uh, Dad, you’re not going to like this much, but guess where I am.”