I had used Apple //'s in college, especially on the college newspaper. This was when we had to use a typesetting program that used arcane codes, and perish forbid you made a single mistake. We had to take the disk halfway across campus from the newspaper office to the graphic arts department, and it was there that we would find out if we had screwed the whole thing up or not. (Even if it came out perfectly, we still had to cut up the photomechanically transferred text from the long strip it came out on and paste it up on lightboards. Very primitive).
One day, one of the graphics arts guys had a Macintosh, the original. Now, I had heard vaguely about this thing. I thought the mouse was an interesting innovation, but hardly a game changer. Then he showed me MacWrite. He had some text on the screen, but it didn't look like the standard cookie-cutter text on the Apple // -- this actually was in Helvetica. Then he highlighted one portion -- which in itself was cool -- and switched the font to Times (or whatever the psuedo-Times font was called back then. Then he highlighted another word, and made it bold. Another became italic.
The next sound we heard was our jaws hitting the floor.