The Door is a relatively predictable and controlable event in Enthropy. You see, it appears randomly in the shape of an entrance, or a door, or something like that. If you enter it, you leave it immediately. That way, it seems like you entered and then left.
Now, it always changes the body of the persons that entered the door. It's unpredictable what exactly happens, but most of the time it increases muscle mass, increases height, and increases...well...it increases manliness. It's always benign to the "recipient". Never does it do something detrimental to him or her.
Well...sometimes it is, but that is rare, VERY rare.
The changes either happen immediately after leaving the door, within an hour after leaving, or on a trigger like a word, or object, or action.
Well, damn, one Door has appeared right now. If you'll stay here, I'll be right back. God, I wonder what it is now...