One day years ago I decided it would be fun to embarrass my little sister. At the time we attended the same school. It was the last day of school before the Christmas break. I walked up to her in the hallway, gave her a big kiss on the cheek in front of her friends and shouted:
MERRY KISSMAS LITTLE SIS!!!
She was mortified but also laughed and then we continued to laugh about it for years later.