Most of us have been there. You're at the big summer festival, a blissful mix of great music and great friends, life is sweet.Yet looming on the horizon is the utterly dreaded moment when you know you will have to use the festival toilet... So we love that Personal Fest in Argentina decided to bring a little joy to the experience. Some of the toilets were linked up to LED lights and a music system. When a toilet was in use it would play part of a tune, if another one was then occupied the tune would build, if all were occupied a full song would be played.