"Tasty Soup" joke

After his recent stay in the hospital, Pa was particularly irritable, especially regarding food. At a nearby restaurant he stopped for a quick meal and the waiter provided a bowl of soup.
As the waiter turned away to return to the kitchen Pa stopped him, calling: "Waiter!"
"Yes, sir, is there something wrong?"
"The soup. Taste it," replied Pa.
"I beg your pardon, sir?"
"Taste it."
"But, sir, I can assure you that the soup is excellent."
"Taste it," Pa persisted.
"Sir, the soup was made this morning of the finest ingredients."
"Taste it!"
The exasperated waiter finally relented. "All right, sir, I'll taste it." Then after a pause he said, "Where is the spoon?"
To which Pa replied triumphantly, "Ah ha... "