Well, since I still don't have a driver's license (I really should start cracking on that), I'm not really ever alone in a car. But I can tell you what I do when I'm alone on my scooter, though.
I sing along to my MP3-player. Badly. Oh, and quite loud. People can't recognise me behind the helmet anyway. Hehe. So if someone on a silver scooter passes you by going "...the TRUUUuuuuUUUUTH hurts WOOORSE...", that would be me.