<br /> <p>While attending his granddaughter’s birthday party at their family home in New Jersey, this grandad was not prepared for the news he was about to receive.</p><p>With the help of his fellow family members, David decided to prank his father. Setting up a camera among his daughter’s birthday gifts and using a radio to broadcast the shock announcement, David waited patiently for his father’s reaction to his foolproof prank. Credit: David Flynn via Storyful</p><br />
