I teach computer classes to retired and seniors
Adults are generally easier to teach than kids, but this doesn't hold true with computers.
My lab is open to the general public right before class, and I have to boot out the hangers on with a great deal of firmness.
Last Friday, one of these hangers on was in a panic over an e-mail. I said: "You can go ahead and finish what you're doing, but I need the lab for my class"
"Help me!" she said.
"Whats the problem?" I ventured helpfully.
"I can't send or save this e-mail!" I walked over and glanced at her desktop. In the address line of the e-mail was an actual street address. I'm well known for being a patient, non-patronizing sort, but I found myself biting back laughter.
"You need to put an e-mail address in that line."
"Whats that?"
"You have an e-mail account, and you're in it right now.

In order to send that, you need to put in a user name followed by an @whatever dot com. Just like what you registered to get
your account"
"But I don't want to send it now".
"I thought you said you were having difficulty sending it"
"Well, I AM going to send it, but I need to print it first."
"Do you mean you want to physically send this?"
"Yes."
"Why don't you just type it up in
Word?
"Oh...thats too hard."
I found out that she had been using e-mail as a wordprocessor for some time; she refused to believe that messages were actually sent electronically. She typed out a message and printed it, affixed a stamp...that was e-mail.