“Late 1990s” is a bit of a stretch. Dialup ISPs were widespread by the mid-1990s, and there was broad enough demand that third parties shipped TCP/IP stacks on Windows 3.1 before Windows 95 built one in.
The fun one was introducing people to basic concepts, like "Ok, that thing is your mouse, see the two buttons? Let me explain how you're going to use them on this call.