Sprinting for your train, making it, and not being even slightly out of breath. THAT'S cool.
Speaking of the train, it is slightly awkward to get to a "good" part in a book you're reading, when you and the rest of the passengers are packed in tightly as sardines. I just pretend I'm invisible (and my Kindle is, too). Besides, everyone else is doing their own thing, anyway. Nobody is reading over my shoulder. Right?!