What is the best tip you have ever gotten?

I’ve been doing this for a couple months, and I took a $32 order ($10 or 11 from Sam’s and another $20 from the customer) to shop at Sam’s club for 19 items and a 10 mile drive. There was a Hispanic lady at the house that moved her car so it’d be easier for me to deliver everything to her porch, and when I was done she handed me a zip-loc bag with an ICE cold Gatorade, Hot fries, a $10 bill, and these freaking AMAZING Chocolate covered Cherries from The Fruit Company (a quick google search showed me the 3 oz bag costed $10. The lady was so nice, I still think about that delivery and wish other people in my area were even half as nice as she was.