My school computer room had a single old machine which took 8" floppies, entirely unused and gathering dust in a corner, when I started computer studies in the late 80s, and a room full of 5.25"-equipped BBC micros... By the time I left, the BBCs had largely been replaced by semi-IBM-compatible RM Nimbus PCs with 3.25" drives.

At home, on the other hand, I spent a while with an Amstrad PCW - running CP/M from 3" floppies!