Actually, the worst one's IMHO are those folks who, whether it be elevator, escalator, airplane, whatever, step out/off and stop! They block everyone else who is leaving whatever mode involved and jam things up for everyone just because they have no clue where to go or what to do at that point. I literally always move as far from the exit as quickly as possible and then step to the side to load things on my bag, figure out which direction i need to go, etc. Not sure why so many folks think they need to block the exits to figure out what they should do!