You shouldn't risk an accident when behind the wheel.
Dave is driving with his wife Amy as his passenger along a freeway, in the middle lane.
Dave wants to change lanes.
Dave signals that he will change lanes, looks at the mirror and then changes when it's safe to do so.
Dave swerves into the other lane without signaling or looking into his mirrors or blind spot.
Amy is happy Dave is such a safe driver and feels comfortable letting him drive her around.
Amy is horrified and her life flashes before her eyes as she gets very angry at Dave.