I've had this happen to me in Detroit, two kids were riding their BMXes on the sidewalk the wrong way, I was in the street the right way, at a driveway they pulled into the street, stared at me with that "i'm tough because I don't know how to smile" face and aimed for me, I had just checked my 6 and it was clear so I swirved out of the way and smiled and said "Hello".