I'm rubber, you're glue

Setting: a four-way-stop intersection.

A car heading east stops at the western stop sign before proceeding into the intersection. As the car is three-quarters of the way across, a pedestrian steps into the eastern crosswalk. The car stops so as not to flatten the pedestrian.

Meanwhile, a helmetless cyclist speeds down the street heading north. The cyclist does not stop, nor even pause, at the southern stop sign. He is then obliged to swerve around the car that has unexpectedly stopped in the intersection. (Unexpectedly, that is, if you expect cars to routinely run over pedestrians in crosswalks.) As he pedals on, he screams back over his shoulder "ASSHOLE!"