The cranky days of summer

When Karrie and a clerk at the Coolidge Corner McDonald's can't agree on her order, the woman next in line explodes:

... At this point, a rabid bank teller pushed me (Me! all 6ft and 240 pounds+ piggybacking toddler!) and barked "Oh forchristsakes! Why didn't you make up your goddamn mind before you came here?" ...

Then it goes downhill from there.

David Pye, meanwhile, witnesses two annoying slackers too wussy to duke it out like real men at Prince and Salem in the North End, so they wind up screaming at each other from opposite sides of the street.