Pearls Before Swine by Stephan Pastis for March 14, 2002
"Where did you get your cap o' immortality? It wasn't at the used clothing store, was it?" "Please...I cannot reveal this, as it is one of the mysteries of the universe, revealed to only the chosen few." "Until then, you will have to remain a stupid pig." "Of course."
Until WHEN he will have to remain a stupid pig?