@mathew I heard that story too. I really hope the person wasn't fooled by the fact that Animal Crossing automatically generates messages from "Mom" to your in-game mailbox every now and then. But if they really were real messages from his real mom - and they very well may have been - then that's a lovely story.
I also recall the story of the guy who was dusting off his old Xbox on which his dad played a car racing game before the dad passed away - and the guy discovered that he could race a 'ghost' of his dad's best performance on the tracks. So he played it over and over as a way to race his dad again, though he would always stop before the finish line so as not to overwrite the ghost.
There are people who say that video games are only mindless entertainment, but I know they're an art form that connects people in ways no one could have imagined.