The Count was (I beleive) hiring Ernie to answer his telephone for him whenever it rang, but he warned him it would be difficult. Ernie couldn't see what could be so hard about answering the phone, but then the phone rang. Ernie tried to answer it, but the Count wouldn't let him because he wanted to count the rings. Finally, whoever it was hung up and the phone stopped ringing. The Count said something to the effect of "I told you it would be hard."
My personal favourite (although I only barely remember it) was when the Count was going to bed and wanted to count sheep, but all the sheep were on strike or something, and so the replacement sheep showed up. It turned out to be an anything Muppet (a blue guy with a beard, I think) wearing a sheep costume. And this same poor guy had to jump over the Count's bed again and again and again as the Count counted him.
"One fake sheep! Two fake sheep! He's getting tired. Three fake sheep! Four..."
Finally, I love that moment in _Muppet Family Christmas_ when Kermit is really worried about Miss Piggy, and he's looking out the window.
Doc: "That is one worried frog."
Count: "Aha! That's one! One worried frog!"
Robin: "He's not the only one."
Count: "That's TWO! Two worried frogs! Ah ah ah ah ah!"
Classic.
-Sidebottom