The Bridge of Khazad-Dum.
In order to capture opponent's pieces you must first cross the Bridge of Khazad-Dum, which is represented by a series of pawns arranged surrounding d4, d5, e4 and e5 and falchioning out towards the far diagonals of the board. If a person who is giving checkmate does not say "Fly you Fools!" upon checkmating his or her opponent, that player immediately loses the game.
The Hole!