I once made cinnamon rolls without the cinnamon. I hate it when I do that.
Let's hope you don't find Jimmy Hoffa. Otherwise, have fun rediscovering. I used to rediscover and not know what it was for. So now when I have something I'm not going to get to right away I leave a note or the pattern, or why I stopped (ie. what my problem was with the project) Then when I get back to it I can get started on it and not worry about using something that I will need later.