Slow walkers.
I don't mean elderly or physically disabled people or people carrying heavy stuff. I mean able bodied long legged physically capable unencumbered people walking at a snails pace along the busiest part of the mall, sidewalk, hallway or airport.
Slow walkers have a knack for finding each other and walking side-by-side. Slow walkers have tunnel vision and cannot see anyone else around them. Slow walkers stop and pause in front of escalators, elevators and doorways with no intention of proceeding.
Many times walking in a mall I've had to make evasive manouvers, with my 5 year old daughter in tow and carrying arm loads of shopping bags, around packs of slow walking 6' tall able bodied adults.
If you can't walk faster than a 42" tall 5 year old then get the F*** out of the way!!!!!!!
Ok, I'm done. Thank you bozo for the opportunity to get it off my chest.