Back in 1995 I bought a laptop. It was a good one for its time with lots of connections on the back like a Centronics printer port, serial port etc. Sadly it only had a single PS/2 connector so I could add an external keyboard or a mouse but not both. This was before USB, oh Child of the Future so that wasn't an option.
I lucked into a useful cable, a PS/2 splitter that offered PS/2 keyboard and mouse connectivity from the same port. It worked fine with the laptop and I used it in good health for several years then it got put in a box as my need for it diminished.
Coming up to the present day I'm building a new desktop for myself. The motherboard I chose has all sorts of whizzy go-faster bits but only one PS/2 port. You can probably see where this is going, can't you? Surprisingly I found the splitter cable in the first box I looked in. This is not a normal occurrence in the tip I call home. Plugged it in, works fine. I can now use my old Olivetti PS/2 keyboard, the one my fingertips are attuned to hammering on over a decade of use and abuse and ditto for the old "Harry Potter" branded Memorex PS/2 mouse my hand curls familiarly around when I reach to my left. USB? Pah, who needs it.
The bad news is that this has put a hiatus on my attempts to throw stuff away. My "I'll never need that again" hitpoints took a serious dinging when I found that cable again. Oh, and the 1995 laptop? I've still got it, it still works and I can't bear to throw it away because, well, see the title of this posting...