That is one of several reasons why, in any given situation, the left and right ears hear a different sound.

He began to scratch at something behind his left ear.

She was looking away from them, so that they had a view of her left ear.

The point sliced off a part of the man's left ear.

He could see the lead for it going into her left ear.

He had been shot once in the back of the head, behind the left ear.

He heard what seemed to be a whisper in his left ear.

She's already dead from a shot clean through the head just above the left ear.

I found a point beyond his left ear, and just stared at that.

How would it have been different had I picked the left ear?