Oh good lord...

I'm flipping through the channels this morning and I come across the very end of The Grim Adventures of Billy and Mandy....

...and Billy says, "I miss Cthuhlu!"

I've GOT to find this episode...

Edit:
ugh...All I've found so far is a synopsis!

The Prank Call of Cthulu
Written by Maxwell Atoms, Alex Almaguer and Mike Diederich / Storyboard by Alex Almaguer and Mike Diederich

The title is a take-off on HP Lovecraft's story "The Call of Chthulhu."
Billy's search for a phone without caller ID leads him to his own basement, where on the wall hangs The Phone of Cthulu, the most dangerous phone in the universe. After being warned by Grim that using the phone could awaken an ancient, slumbering creature who will rise from the murky depths and destroy the world, Billy just can't wait to try it.

Most notable moment: After Billy and Irwin are sucked through the phone to Cthulu's dimension, Grim wonders why he can't just leave the boys right where they are. Mandy replies, "Because 'The Grim Adventures of Mandy' doesn't sound as good as 'Billy and Mandy'."

I'm sure the writers of this show have been waiting for years to be able to say, "It looks like Endsville for Endsville," and this was their chance. (Thanks to Floyd for sending the lyrics to me so I didn't have to transcribe and retype them!) It looks like it's Endsville for Endsville
The Endsville we all love was just a fluke
We have tentacles, sharp teeth,
And great big gills,
But the sushi in this town all tastes like puke.
It looks like it's Endsville for Endsville
The Endsville folk have really lost the fight
We have sunk into some
Weird amebic ooze
So, flush it down and don't forget to wipe.
(toilet flushes)

There's a moment in this episode where Grim walks into the cafeteria and says he wants the calimari, and most of the occupants of the cafeteria, which are some kind of squid or other, turn to look at him. But Mandy did it first and she did it better! In "Toadblatt's School of Sorcery," Mandy terrorizes the Sorting Squid as it's just about to settle on her head when she says, "Good. I'm in the mood for calimari." Much funnier.

WWhile the credits roll we see Grim on the phone trying to order a pizza and then being sucked into the phone line by Cthulu, who has been trapped there by the trick Mandy pulled on him.

I also found a short on you tube:
[url]http://uk.youtube.com/watch?v=harxU24pxf0[/url]