Went down to paint on something earlier today, and I was hoping to replicate an effect that I had done for another unit many moons ago. Turns out, I forgot how to do it, so I got to spend some time google-whacking to find the recipe and technique. Generally, I write the recipe down, but that's not the same as keeping it around for months afterward. Although, given the glacial speed with which I paint, sometimes it does amount to the same thing.
tl;dr - Forgot how to paint something, finally found it; I am an idiot for not keeping a box of instructions handy for quick reference.