Luis, dressed as a magician, demonstrates addition by conjuring up the correct numeral when David and Maria arrive. As each person leaves, Luis switches the numerals to present subtraction.
Ernie and Bert: Ernie answers the telephone. Bert overhears the conversation, which involves a baseball game, a rainy day, and a gorilla stealing a baloney sandwich. When Bert asks who just called, Ernie says it was a wrong number. (EKA: Episode 0667)