A fog machine appears in the music video Zombies on Your Lawn during the second half of it. Its only purpose is to most likely simulate the fog in the Fog levels for the purpose of showing all of the stages during the music video.
It is unknown whether or not the zombies used it to create the fog on the Fog levels.
In the credits, the fog only covers the bottom half of the screen. In Adventure Mode, the fog covers the entire right and sometimes middle sides of the screen.
The fog machine cannot be obtained, as it was only seen in the video.