At one point a well-known FTP server would let you access it with Samba, complete with R/W access to certain directories. I had an Amiga with a small hard drive, a modem, and the "VMM" virtual memory program. Experiments led to me creating a 2GB sparse file on the FTP server, mounting that server as a volume, and pointing VMM at that sparse file. Voila! An Amiga with 2GB of RAM, so long as you didn't mind swapping at about 5KB per second.

That was completely useless, but it was great fun to get working at all. I hope my sparse file was actually sparse on the server, too.

Not just porn, but also warez (pirated software). In fact, I'd say warez was much more common than porn, though that might be because of observer bias...