I recently logged back into my telltale account on a whim and was surprised to find that I owned "Back to the Future: The Game". Even though I'm certain I never bought it. It's not listed on Steam or GOG, but I think you can find it as abandonware somewhere.

Have only played a bit so far, but it looks pretty good. It's a typical point-and-click, not a "X will remember this" story game.