when it's dark and raining. You come up behind an L300 van doing 20km per hour in the left lane. You start to move right to overtake (undertake?) him, as is normal on the Dasmarinas to Tagaytay road, and then you realise he is keeping pace with a bicycle, with no lights, who has just swerved left to avoid a hole at the edge of the road. Who had the biggest fright?