This grandad was busy cooing over his new granddaughter in Ennis, County Clare, when his son decided to play a trick on him.Swapping his daughter Robyn with a baby doll, Ethan convinced his father Patrick that he had just thrown his own baby into the air.In the video uploaded to Facebook on September 9, Patrick can be heard roaring “Jesus Christ, my neck!” as he watched Ethan drop the doll onto the floor. Credit: Bebhinn Tuohy via Storyful