People can hear you on your bike

The other day I was riding home from work. As I approached an intersection, I saw a young woman in comfortable looking clothing standing on the corner. She had over her shoulder a large canvas bag, peeking out of which was a large rolled up mat.

Assessing her appearance as I approached, I said aloud but to myself, without really realizing it, in kind of a sing-song voice, "Oh, did you do yoga?"

She whipped her head around and watched me with a boggled, surprised, slightly incredulous look on her face as I sailed past.

Sorry, lady.

I'm a talk-to-myself-er and sometimes I forget people can hear me when I'm on my bike.