One of the computer labs in middle school was full of Macintosh LC IIs with Apple //e compatibility cards in them, and 5.25" disk drives connected to each one. I can only remember using them once or twice to run Apple //e stuff, using them as Macs the rest of the time. I have an external hard drive with the software to run one of those, but have yet to track down the card itself to install in my Mac LC III. Apparently, you not only need the card, but also a special cable which goes with it to allow the use of the 5.25" disk drive (never plug one into the LC's own floppy drive port).
Slightly off-topic, but how many people used classic computers at home for school purposes, after they were considered classics? Throughout high school (late '90s/early '00s), I was known to use my Commodore 128D or Macintosh SE to type up homework assignments, since that's what I had in my bedroom (used GEOS 128 on the Commodore 128D, and some old version of Microsoft Word with the SE; both printed to good ol' dot-matrix).
-Adam