In elementary school, there were a couple teachers in my hall that had games on their Macs (we're talking like late 80's, early 90's) and every chance we got, we'd try to get them to let us play on breaks or recess or whatever. I can't remember which came first technically, but it was either King's Quest 3 or Space Quest 2. Those old games where you had to actually type in what you wanted your characters to do...