I was behind a delivery truck in the leftmost left-turn lane.  The truck
driver started moving on the green signal, and I was accelerating at the
same time.  The truck was almost halfway into the intersection when an
MFFY Sloth in the rightmost turn lane swerved in front of the truck,
stopped, and then made a slow and wide U-turn while traffic in both turn
lanes was held up.

What's wrong with these stupid drivers?