Went in one ear and out the other

Have your ear to the ground

You can't make a silk purse from a sows ear

Now they are ready to hear it. If you tell them before they are ready, it goes in one ear and out the other.

Sometimes when everybody is playing at once, I listen here with one ear and overhear with the other ear.

Well, next to fingerprints, the ear is the best identifier. Each ear is different and there is only one person in 200,000 that has the same ear configuration,