Well, I guess it’s possible to be a little too subtle with a punchline. Most people didn’t get this one without an explanation, and any joke that needs to be explained is doomed to failure. Oh well. You can’t win ’em all, I guess.
That being said, this comic was inspired by the dentist office next door to my college coop. Every fall, they send us a bunch of cookies. Perhaps you see where this is going.