I did not experience it myself, but it happened to a friend of mine.
My friend was in a bad car accident driving to her university which was thousands of miles away from her home. Her car was destroyed in the accident and she had lost almost all of her possessions. She had been taken to a hospital, but was refused treatment because she did not have insurance.
Her parents said they would pay for an airplane ticket home, but she had to get to an airport. But she had no money and no way to get to the next airport which was about 1 hour away. So, she was standing on the sidewalk, in pain, with a broken piece of luggage, not knowing what to do, when a man stopped his car and rolled down the window. "Wherever you need to go -- I'll drive you there," he said.
Obviously, she thought he was going to take advantage of her. She said "No thank you." But the man said "You were just in a car accident and have no way home and no money, right? That happened to my daughter last year, and I thank God someone helped her get home. She looked just like you do now."
She decided to trust him, and he drove her the 1 hour to the next airport and made sure she got on her flight home.
That's the most touching act of human kindness I've ever personally heard.
My dad and I were traveling in Asia, and a new friend I had just met offered to carry my backpack for me. I told him, it is okay, I can carry it, but he was so kind and insisted. I have never forgotten his kindness.
Another time was when my mum was in the hospital. She had collapsed from a cardiac arrest. My dad and I met a doctor who talked with us about her treatment. He was so understanding and also prayed with us. It really encouraged me during that dark time.