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I was just playing some Mortal Kombat when I noticed that the sign on the Rooftop stage of Johnny Cage's movie, "Ninja Mime" was changed into a Jack in the Box Ad. The sign on the other side of the stage has been changed into a Jack in the Box sign as well.
Update: This sign is also seen on the Street stage as well as the Subway stage.
This is the first MK9 Jack in the Box video on youtube.