Whenever I make the 4 hour drive to my parent's house, I always sing almost the whole way to keep me awake, especially at night. Now, I understand why:
And never be embarrased if someone catches you singing! Encourage them to join in. My problem is that I love songs that are just a little out of my range, and I give myself a sore throat.
I'm not too animated because I'm usually concentrating on the singing. It ticks me off if I can't hit a note I used to be able to hit, or follow a song that I know by heart. It's the performer in me.