Ok, since people are posting ideas here, here's one that I had that I want to put in if I ever get the chance to make a game.
While wandering the world, in some remote area, you find a crack in the mountain, or a door in the mountain, not sure which. It could be that the door is closed and looks like the mountainside, so you wouldn't know it's there unless you highlight it. Anyway, you open the door, and inside you find a lot of machines running and such, kinda like a clock maybe with lots of gears moving. There is a note one a nearby table that says something like:
George -
Make sure you lock the portal this time, the last time it got left open, one of the characters crashed the system.
- Fred

This note would of course be to and from some of the developers, and it seems that you have stumbled upon the "Engine Room" of the game. Mabye it would be possible for you to "crash" the system, where everything freazes, and one of the developers walks in to fix it, and you are standing frozen. The developer moves you back outside, and locks the door, and fixes the problem, and everything starts back up.

Now, what do you think of that one?

Rithe