Make sure you take detailed notes, including your error. My best beer is one that was designed as a one off "fluke" to over-IBU a buddy. It turned out to be one of my best, but I took detailed notes, and can replicate it. I can't keep it in the keg.
"Lady, you want me to answer you if this old airplane is safe to fly?
Just how in the world do you think it got to be this old?"