I frequently find pedestrians more frustrating than cars on my commute.
The last 100 yards or so of my commute is through a bus depot and up the sidewalk towards our office's parking garage.
I'm usually saying "on your left" until I'm blue in the face and creeping along at their walking pace. Pedestrians are far less predictable than cars, they tend to "drift" on their walking path, they wander around without a glance. And don't even get me started on jay-walkers.....