Two guys, both in pickup trucks, driving opposite directions on a two-lane road. They recognize each other, and both just stop, driver's-side window next to driver's-side window, and proceed to have a conversation through the open windows. And nobody goes anywhere in either direction 'till they're done.
I swear I am not making this up.
Then there's the legion of dudes from New Jersey or the greater Boston part of Massachusetts who drive to and from the ski areas in large SUVs. None of them have the slightest inkling that, even in an SUV, you have to slow down to stay on the road when it's snowing. They tailgate in the snowstorm, and eventually whoosh past, setting up such a cloud of snow that you lose what little visibility you had. In a mile or two, you come by them in the ditch, and they think you're cruel and rude because you wave at them and keep going.