I am one of those annoying people that sing all the time. If I hear a song I love then I just bust out singing with it. I don't care if I am at work or in the car or just out shopping. I can't carry a tune in a bucket but I love my music!
i sing all the time. In the shower, at work, around the house. I have learned to keep it down, just because my 3 yr old likes to sing along and in the shower is not where i want company! But yes, i sing everywhere and just about any time as well.