First I want to say thank you for starting this thread; a few 'stories' have my eyes filling up.
2nd strangely I was thinking earlier today about the day I had a flat tire and no stroller in my car. (30 plus years ago), carrying my toddler and expecting number 2 son in a few months, I saw a lady getting into her car and asked her for a ride. She did look surprised and very cautious, but did give us a ride.
Just recently I was selling at a craft fair and a customer was asking the price of a book (I was selling with a pillow case) she wanted to buy only the book for a charity she is teaching non english speaking children. I gave her the book at no cost.
One day I pulled over and got out of my car when I saw an elderly man fall in the cross walk. He refused help and was not hurt.
I do let folks go in front of me when they only have a few items and my carriage is full.
What I really like to do is stop and let a car go in front of me, espically when I am being tailgated.