Did you ever notice...
In the Thanksgiving episode, when Cartman finds the food shack that Sally Struthers is hiding in, he says, "Ah, wonder what's in heoh..." (here)
And in the Christmas episode, during the Mr. Hankey commercial, the narrator says, "The Mr. Hankey playset comes with everything you see heoh!" (here)
Just a small observation. Could it be that the Mr. Hankey commercial narrator is the same guy who does the voice of Cartman, but he has a small speech habit?