Reading the responses, if you change oil all-day long, the 'dogbone wrench' is your go-to, for all the different sizes you may encounter.
icthruu74's comment about "I had one in my 10-speed's tooolbag," at-least gave me memories of my time when a bicycle was my primary means of transportation. However, I don't think I ever bought one, or asked-for one, though with three older brothers, I have vague memories of one of these somewhere in the tools on the workbench. The shape of the tool prevented it from being used on many fasteners. With the apparent utility of it for oil-changers, I didn't see much-use for it now, or then.
I'm trying to think of another 'nearly-useless tool,' and I suppose some of the 'multi-tool designs' come to-mind. I carry a Leatherman
micra on my keychain and I find that useful. One multi-tool I think doesn't fill the bill, is the one like a credit card which has stepped spacing for use on nuts, which would have so-many interference issues, it would be discarded in-frustration, from trying to make it work.
https://levergear.com/toolcard/?gcl...-IGdGT4onGAZ3sIbcv-PvStebnKEOPOxoClOMQAvD_BwE What other useless tools are out-there? The Gator-Socket was already-mentioned, along-with the Bionic Wrench. The former I know-of, the latter, I'm gonna have-to google. I did. Oh,
that-thing!
Here's a tool I found when searching for the Bionic Wrench. You wear it on your finger. I can actually see where that might be suitable for starting nuts in confined spaces.
https://www.youmagine.com/designs/finger-wrench-digit-spanner