What is a small act of kindness that someone has done for you that made a big impact on your life?

Growing up I was always really bad for leaving my wallet around places. I’ve lost my wallet in three or four separate locations around my city and I’ve had it returned to me every time. Sometimes someone emails me, sometimes someone calls the number on it, I had it mailed to my address one time, my mom loses her mind when she saw it and the big impact it had was I didn’t lose all my identification luckily.