Lullaby For a Dead Man is a song written by Treyarch's music department (sung by Elena Siegman) for the Zombies game mode. Part of it is played at the end of Nacht Der Untoten (when all players are down and it is game over). Its full-length version can be heard as an easter egg in Verruckt. Outside the Power room on the German side of the map the player can find a row of toilets. Flushing the one closest to the door to the Double Tap Root Beer room three times (using the "use" button) will result in the sound heard when flushing a toilet, followed by the song.