What tunes do you hum?

I was helping my husband clear breakfast dishes this morning and I found myself half humming and half singing a tune. I realized it was a religious song, which for some reason took me by surprise. I started thinking about my mom and how she always seemed to be singing a church hymn, but never any current music. When we were growing up she never listened to the radio and didn't know who any of the most popular recording artists were. I thought she was so un-cool. I'd never have guessed I'd end up singing gospel music around the house when I grew up. Scary, ain't it? I'm more like my mother than I thought, and somehow I think it's pretty cool.

So... what tunes do you find yourself humming these days?