I have a couple of boxes of 5.25-inch floppies! formatted for the Apple ][. I've kept them since I had one. Mostly for their aroma; it's capable of evoking memories that nothing else can. Still, from time to time I feel like booting one. Maybe I'll try sometime soon.
Smell is an interesting sense that way. I was just back in my college engineering building at an industry event, and it has such a distinctive smell. I'd never be able to describe it, but it calls up so many memories.
Sadly not something that I can put in a box and hang on to. They've talked about replacing the building for years, and once it's gone that smell will be lost forever.
