Yeah....

Some typical titles for you:

The Deer In Headlights: This person hears you say on your left then just stops in the middle and turns around to look at you

The I-podder: You're back there screaming and they are walking along without a clue, right in the middle

The Dog Walker: No leash and simply calmly says 'no buffy, staaaay'

The Frantic Family: Husband, wife, kid on a bike with training wheels. You try to get past and they give you a look like how dare you interfere with my child

The Snow Worshipper: The guy who is taking up the entire path with his little pretend skis on wheels

The Knave: Well, you know all about that one