You shouldn't make illegal maneuvers while driving.
John is driving with Nancy as his passenger and the're on the freeway in the middle lane.
John wants to merge into the left most lane.
John turns on his indicator and checks his mirrors before starting the lane change.
John immediately swerves into the left lane without signaling or looking in his blind spot.
Nancy is happy that she is being driven by a safe driver and feels no danger.
Nancy is terrified and fears for her life as her stress goes to maximum instantly as the car screeches along.