"I used to work in a restaurant, I worked the drive-through. And they had a mic, and so I used to sing. (They would be like,) 'Is that someone singing or is that the radio?' Whatever came to mind I would just sing it and entertain the people - so like every time a car came around you would hear the beep and I was like, 'Oh, that's my chance!'" Hitmaker Jennifer Hudson used to test her singing chops on fast food customers.