I was reading some threads today, and I realized something about my play history. To the best of my knowledge, I've played almost no games with magical macguffins. I'm not sure if my GMs just chose to go a different way, or if the macguffin was hidden well enough that i didn't realize it, but that leads me to my question. Do you have any memorable experiences to share involving campaigns or adventures that had a macguffin of some kind as a central plot element?
For those in need of an explanation, a macguffin is an object that is important mostly because the plot says so. If you could swap it for a different object with no more effort than a find-replace on the text of the story in question, and have exactly zero impact on that story, then you have a macguffin. The macguffin can have powers, but they should have no relevance to the plot. (Note: the one ring from LotR is not a macguffin, because the ring's corrupting influence is central to its nature and important to the plot. The arkenstone from the Hobbit is a macguffin, because we could have replaced it with a necklace or crown or statuette and had the same plot.)
So with that out of the way, who's up for story time?