A friend of mine thinks she may have lost a earring down the shower drain. There's a trap with a clean out plug accessible in the basement, so I figured I'd check it out.
It looks like that clean out plug hasn't been turned in a very long time, perhaps longer than I've been alive, so it's not budging.
There's a limit to how much force I ought to put onto non-leaking plumbing that I would like to remain non-leaking, so it looks like the earring is gone for good.