You’re on the motorway, an on-ramp looms, car coming along it wanting on the road with you. So you pull out into the second lane allowing the motorist to come out without having to worry about it. Next you’re alongside each other and the jerk stays level with you, you can’t come back into the lane so you either have to slow right down or speed right up. So much for trying to be nice.
Oh, pet peeve 17B: not moving out of the lane and having the other motorist floor it so they get there at the exact time as you and move out anyway expecting you to break or crash.