My dad was turning 90 and we were planning a party. He wasn't involved in the party planning but we also didn't want to surprise a 90 year old man. He loves doing puzzles so we made him a puzzle of the invitation to the party. When we gave him the box (and once he got over being disappointed that it wasn't chocolates:) he sat right down and put the puzzle together. It was a great way to invite him to his own party.