I have an author photo coming up and I should do my nails, but what colour?— C.L. Polk (@clpolk) July 26, 2017
Which reminded me that, somewhere back in the glory days of Shadow Unit fandom, I'd joked about color-coding one's nails using the old resistor color coding scheme. So I recalculated Pi to ten significant digits and provided this reply:
Left hand: orange, brown, yellow, brown, green— Edmund Schweppe (@edschweppe) July 26, 2017
Right hand: white, red, blue, green, orange
Then see who decodes it.
Which then led me to try and remember exactly when I'd made that joke.
Which (once my Google-fu failed to locate the joke in question) led me to starting a re-read of the LiveJournals of Chaz Villette, Hafidha Gates and Daphne Worth.
The good news was that I was able to find the reference relatively quickly:
Well, if you want them to think you're getting your sense of humor back, try painting the toenails as follows (left to right): orange, brown, yellow, brown, green, white, red, blue, green, orange. Then see who figures it out first, 0metotchtli or trollcatz
Alas, I discovered that the Shadow Unit forums were down hard. The Wiki has been down for years. Even the CafePress store appears to have gone poof.
Further alas, all too many of the usernames I ran across while searching had the tell-tale strikethroughs of deleted accounts, reminding me of how it was only a few months ago that LiveJournal's Russian ownership changed their Terms of Service in ways that drove many of my friends off their site altogether. (Me, I just stopped crossposting.)
 For values of "recalculate" equal to "looked it up online"