Paper Magazine, which always has fun online features, has a photographic survey of 15 celebrity subway riders. Some are truly regulars, like Mayor Bloomberg who is known to take the 6 every day from his manse on the UES to his office down at City Hall. Others, well, are a bit of a surprise....like Keanu Reeves! There's also a shot of Anderson Cooper taking the C to W. 4th (I'm assuming this because he lives in my neighborhood).
So from here on out, I will not discount my celebrity sightings on the MTA. In fact next time, I might even have to take a photo.