I had to do one of my 2x a month grocery store runs for myself, and usually end up at Aldi's due to the low prices. I make sure I have a quarter for the cart and you get it back after the cart is returned. I also bring my own bags so I do not have to pay 10 cents a bag. A woman was unloading her cart, then I offered a quarter and she took so she would not to walk the cart back. On the way out as I didn't have a lot in my 2 bags, I saw someone fumbling for a quarter and offered my cart after removing items. She didn't have the quarter and I let her have the cart anyway. She said "you are too kind, not many out there, I insist you take this dollar instead for your kindness and i will not take no for answer." She gave me the dollar. The dollar went into the collection plate the following Saturday evening with my normal offering at Mass.