....a ground-down slender 13mm combination wrench I use for U joint nuts, a bike wrench I bent to R & R the oil pressure sender, and....
This is something interesting I learned a few years ago. A friend owns a specialty Soobie shop here (and is also a big classic sportscar fan). I was struggling with some job with no room to work and he said, "Let me show you what we do." Then he took my socket to a grinder and made it much shorter, but still enough depth to bite.
So the Snap-on man comes around every week, the mechanics have a list of bits and bobs they need. He told me they often pick up 2 or 3 of the same bit or socket, and then they grind or cut or bevel them as needed for very specific tasks on an engine or transmission.
He said, You're doing great, you just don't know the tricks." So now I'm way less likely to hold on to that single "tool for life" piece, and get another one, or two, and a second deep one to boot. They split (when leaning on them with a long pipe), they wear down, you need to shorten them. So I have some nice Snap-on's and old Craftsman that stay nice forever, and then others they I have for one specific job, in their own little drawer. Same drawer as the weird shaped Audi / VW / Volvo specialty tools that fit their strange transmission drain fittings or hold down the timing chain tensioner or lock the camshafts or.....
For my son's old BMW project, we had to get a set of reverse torx sockets for all the bell housing bolts - I'd never seen them before. One of my sportscar buddies has a whole box of Whitworth tools....I think for working on steam locomotives or something....
Something I might pick up are a few wobble bit sockets, rather than a 10 mm socket on a universal on an extension. They fit into places better and don't flop sideways as much.