Not sure why this isn't common sense, but people: figure out how to form a line without getting in the damned way!
If the ATM is out on the street and you're waiting in line to use it, for cripes' sake *move the hell alongside the wall rather than perpetuating a line that juts out into the sidewalk. Sidewalks are for walking. People can't walk when your punk arse is standing in the way.
*Caveat: do NOT stand right next to the person at the ATM! Give them some space so they don't think you're trying to nab their PIN! ...unless you're trying to nab their PIN. In which case, Urban-Etiquette.net claims no responsibility for Identity Theft.
We realize that many grocery stores are not well-designed for this. That is not your fault. But you can help by simply being aware of the flow of foot-traffic around you and by doing your best to stay out of the way.
Believe us: if you get in the way of a socialite debutante and her crumpets at Whole Foods - you're asking for it!
Form lines. Lines are the commonly-accepted way to wait your turn. Goooood etiquetter, you get a biscuit.
Form lines out into walkways. Again, you can't always help it, but most of the time you can stay out of the way of pedestrians by simply lining up using common sense.