I've got a 15 year old SD/USB combo card on my keychain. I plugged it into a TV around 6-7 years ago because there were a couple of kids movies on there.
I also know I have some Portable apps on there, but probably a little out of date
lol, I feel you there. I got a ruggedized, waterproof USB stick about 6 years ago to keep on my keychain and I've used it maybe three times ever. Though I've also been working from home for the last 4+ years so, y'know, less opportunities to use it in general.
Better to have it and not need it than need it and not have it, though.