Festive Funnies

Today is Blue Monday - so, here's a Welsh joke to cheer everyone up ????????

Dai is at the car boot sale when an American tourist comes by. Pointing to a skull on display in Dai's car, he says: “Whose skull is that?”
“That,” says Dai profoundly, “is the skull of Owain Glyndwr. It's yours for £10.”
“Incredible,” says the American. “I'll take it.”
Some weeks later, Dai is at the car boot sale when the same American walks past and notices a much smaller skull for sale.
“Whose skull it that?” asks the American.
“That,” says Dai in a practised voice, “is the skull of Owain Glyndwr.”
“Hang on,” says the American. “You sold me the skull of Owain Glyndwr a few weeks ago.”
“Aye,” says Dai. “This is when he was a boy.” ?