In Stark Towers after the first or second checkpoint, you will see a Japanese worker standing by a golden Special Kill icon. If you kill him with the Special Kill, he will get electrocuted. Then, when Yakuza henchman burst into the room, you can hear one of them say, "Kenji?". Then when he sees Kenji he screams, "Oh my God! They killed Kenji!". In South Park when the character Kenny dies, Stan says, "Oh my God! They killed Kenny!"