"Garfield Minus Garfield" creates an existential nightmare. Heathcliff without Heathcliff points out the irrelevance of the title character in his own comic strip. Humor is subjective; I think it's funny, but I love anti-jokes.
Garfield minus Garfield was all the rage, like, 15 years ago. They even got them printed in a book. Worth checking out, but a little out of the zeitgeist, I guess.
Although I suppose I now get why this Heathcliff thing is posted, every day is a lot. Although of course subjective, the majority aren't funny and after a while we get the message.