When Moby returns to his desk after Jody and Mark decide to remain in the CAT class, Moby finds a note waiting for him. Who is the note from and what does it say?

When Moby returns to his desk after Jody and Mark decide to remain in the CAT class, Moby finds a note waiting for him. The note is from Jody and it asks Moby to please advise because 1-800-FAT-BOY does not contain enough digits to be a real phone number.