What's the nicest thing you have ever done for someone without ever telling them you did it?

I consistently bite my tongue w my MiL- that counts right?!? ;)

Once I was sitting nearby a woman and her purse fell over. She had family and friends around in front of her. Her purse and the contents weren't visible to anyone.

Well when it fell over a vibrator rolled out. I quietly tucked it back inside then went and washed my hands.

Forgiven them without being asked

Tried to save their life.