One of my "hero memories" was a time when I was a master of Win95 - and a friend had accidentally changed ALL of her display options to black - so all the UI was black, but I knew Win95 so well I could navigate the entire OS via keyboard - and was able to from memory navigate through the start menu, to settings, knowing how many tabs to hit to get to display and change that back to default.

The people watching thought I was a magician.

(I also had several sealed original W95 boxes on floppies...(we shutdown an office, and as IT mgr - I had to go liquidate - and we had ~50 boxes of original release W95s there - so I took several home) and I held them for ~10+ years then sold them on eBay, I only got $25 for each - but I sold them as pieces of "computing history")