God, I remember in the early-ish days explaining what browsers were to AOL users.
It honestly felt pretty early in AOL days that people were mostly just using it for email, chatrooms, and otherwise as a web browser on the regular, non-AOL internet. Then AIM becoming more popular as time went on, but eventually third-party clients totally obviated that in a lesson Google would learn from well (and their takeaway was to destroy Jabber/XMPP with great prejudice before they lose control over their users).
Explaining parents that all they needed to do was open another browser -- literally any other browser -- while AOL was running and they could go to the websites with it was rough. "AOL has you connected to the internet already, you don't need to use it to go to infoseek.com" or whatever.
Whenever they finally did it it seemed like magic. WOW, how does this connect to AOL! Then they'd close AOL and disconnect the modem and tell me the other browser was broken.
I remember all my friends convincing me to switch to Opera because it had tabs and that was revolutionary.