The Ballad of Mary Sue:
DM: OK, after traveling for several minutes, the corridor opens into a room with three doors. One of the doors is wooden, another is cast from metal and the third is carved from stone. All of them are inscribed with strange, sinister-looking runes. What do you do?
Chronomax: Well we should probably inspect each door and see if we detect anything…
Peter: I open all three.