"CHICKEN AT A CHINESE RESTAURANT..." joke

A couple go for a meal at a Chinese restaurant and order the
"Chicken Surprise"...
The waiter brings the meal, served in a lidded cast iron
pot.
Just as the wife is about to serve herself, the lid of the pot rises
slightly and she briefly sees two beady little eyes looking around
before the lid slams back down.
"Good grief, did you see that?" she asks her husband.
He hadn't, so she asks him to look in the pot. He reaches for it and
again the lid rises, and he sees two little eyes looking around before it
slams down.
Rather perturbed, he calls the waiter over, explains what is happening,
and demands an explanation.
"Please sir," says the waiter, "what you order" ??
The husband replies, "Chicken Surprise""Ah...so sorry," says the waiter, "I bring you Peeking Duck"