The setting: A group of kids, both male and female, run out of the house and onto an outdoor swingset -- only dressed in underwear. As they do this, some lady is singing the following to "Happy Birthday:"
Happy Underwear to youI will never know where tehy found a bunch of kids willing to go running around in their undies on national television
Happy Underwear to you
Long wearing, easy caring
Happy Underwear to you.