If a friend who's had too much to drink asks you to drive his truck and boat home and while going down a long steep hill the boat begins to sway back and forth, it is not the time to try to slow down so that it will stop swaying. The harder you brake the worse it will become until eventually the boat will try to wrap itself around the truck, and then take everyone into the ditch with tumbling involved. Don't ask me how I know, I was only a passenger.