One of the most frustrating things in the world is when you want to pass someone either on foot or in a car, and that person, probably not maliciously, paces themselves at the exact speed where it is still "slow" by your standards but not slow enough to pass. You end up tracking them and every time you go to make your your move they match it. Its kind of like Tron.

This morning I was sandwiched between two of the people and I didn't know what to do eventually I turned around and crossed the street.