Stanford women's coach John Dunning likes to have fun with his players in practice. That holds true even if he is punishing them for not accomplishing a task – like rounding up volleyballs quickly enough after a drill.
One of his penalties is having the team choose a song and sing. As punitive measures go, this one doesn't even rise to the level of a slap on the wrist, but everybody gets a charge out of it and it helps create an upbeat and fun atmosphere in the gym.