Going My Way?

Sometimes you'll get off public transportation and find yourself walking behind a stranger who also got off at the same stop. Suddenly, blocks and blocks have passed and you're still unintentionally tailing this person. You notice, but they can't, by dint of them not having eyes in the back of their head.

For the first couple of minutes it's just an innocent coincidence; you're just two people walking in the same general direction.

Three hours later, you're definitely dabbling in the dark art of stalking.