"John gets a call from his Artartian friend, Bill...." joke

John gets a call from his Artartian friend, Bill.
"I've got a problem," says Bill.
"What's the matter?" asks John.
"Well, I've bought this jigsaw puzzle, but it's just too hard. None of
the pieces fit together and I can't find any edges."
"What's the picture of?" asks John.
"It's a picture of a big Rooster," replies Bill.
"All right," says John, " I'll come over and have a look."
He goes over to Bill's house. Bill leads John into his kitchen and
shows him the jigsaw puzzle on the kitchen table. John looks at the jigsaw,
frowns, then turns to Bill and says, "For Pete's sake, Bill, put the Cornflakes back in the Box!"