The room is plain, square, bleached white. The door disappears behind you once you've entered.

In the middle of the floor lies a strange contraption: a box of thick glass, with a hole to put your hand through – it's a tight fit! -- and a copper rod inside. One of you must place your hand inside and hold the rod tightly. The rod will burst into flame; only then can you shatter the box.

You know that the person who does this will not be burned, but will, for the rest of the game, be furious at one other person present – it'll be somewhat difficult, though possible, to focus on other things besides that.