I always make sure to personalize my Christmas card to the boss by taking the time to consider what they've accomplished throughout the year. I'll write a brief note acknowledging their hard work and success, highlighting the positive impact they've had on their team and the company. I'll also include a bit of humor to show that I appreciate them as a person and not just as a boss. Finally, I'll wish them a safe and happy holiday season, letting them know that I'm grateful for having them as my boss.