the story isn't too exciting... my roommate had left out a lighted candle on the kitchen table where I was working. At some point during the 90-minute cross-continental call, the candle burned low enough so that I couldn't see it over the screen, and I absentmindedly scooted the computer too close to the open flame. My roommate noticed the hole in time to limit the damage. It could have happened to anyone, really.
and in case you were wondering, a charred iBook screen back looks a lot like toasted marshmallow. Only it smells a lot worse.