We had an ornery old aunt who made superb banana cream pie. I asked my sister if she had the recipe, and my sister said she asked our aunt once for it, and our aunt said she didn't give it to anyone. (This was no real surprise, the woman was mean and grumpy.)
TEN YEARS later, my sister gets the recipe in the mail from our aunt, out of the blue. My sister had never brought it up again after she first asked. No letter, no explanation, just the recipe. Our aunt died a few months later, and we figure she was trying to make some amends before the end came. We were amazed our aunt even remembered my sister asking about it that one time.