comedy protip: strong/hard consonants are funny. 'kodiak' is an awesome comedic word. Any punchline involving a bear could almost certainly be improved by inserting 'kodiak'. Just like you should use 'buick' when you need an arbitrary car, and 'tuesday' when you need an arbitrary day. This also explains why a well-placed 'fuck' is funny.
He's not a comic genius, he's a marketing genius. His comics are actually quite banal; everyone hates their printers, a list of reasons why makes us feel good but isn't actually funny.
I guess everyone's sense of humor is different. Personally, I found the "literally" comic confronting, but I was rolling on the floor laughing at the gay-roller image... IMO, the guy is a comic genius :-)
Of course not everyone would agree with me that it is banal, but I have read a number of them I've seen linked here and there, including the above. I didn't find any of them particularly amusing. Nor did I like the artwork.
That's the least funny one I've seen yet, it's just some information that most people learn in school put to pictures. The kodiak bear pic however, is funny.
Besides the "komedy k's" that was already mentioned, a kodiak bear is a very specific type of bear. More specificity is generally considered funny when you're describing a story in the form of a joke. Not only does it add tension by drawing out the conclusion, it implies the comedian has actually put some significant thought into the situation they're describing.
Not just a bear. Not a polar bear. Not a brown bear. A kodiak bear. The only thing funnier would be "a 8' tall, ill-tempered, honey-hating, monkey-fighting kodiak bear. Named Maurice."