National Regifting Day is celebrated on the third Thursday of December in the United States, with this year's observance taking place on December 18. The day encourages the practice of re-gifting, which involves giving away gifts that one has received but does not want, often under the pretense of being a new gift. Originally, it started as an office holiday where co-workers would exchange unwanted gifts. The concept of re-gifting is seen as a sustainable way to repurpose unused items, provided the gifts are unused, lack sentimental value, are not personalized, and suit the new recipient. A popular custom associated with this day is the White Elephant gift exchange, where participants can "steal" gifts from one another.