Ernie imagines a world populated entirely by sentient tennis balls. Or something.
Man. Who wrote this sketch, Sigmund Freud? I understand what they're trying to say, but this sketch is rife with potentially unfortunate implications.
Is it funny in spite of the potential implications or because of them? (Or not funny at all?) You be the judge.
The way the "postman" zooms in from offscreen to get his hat from Ernie, I was tempted to try to make a "Please, Mr. Postman" joke, but I decided it wasn't worth it.