Back when I was a young geek, 3.5″ Diskettes were the only affordable thing we had to carry data from one place to another. These things had a whopping 1.44 MB of data on them! WOW! They also could be used as ninja stars, or coasters for your glasses and coffee cups.
Oh, and back in the early 90s, IBM transformed a few of those into calculators that they gave to some of their business partners, but unfortunately, they were never for sale. Sadness.