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Don't Break My Ribs, Whoa Whoa Tonight
Referencing the way Iori broke the team up at the end of KOF'95 (by beating Eiji and Billy within an inch of their lives), Billy and Iori have special intros together in '97, '98, and '02.
In '97, Billy simply points his pole at Iori and says "I WISH I COULD TEAR HIM APART!" (presumably he can't because of Geese's orders).
Billy still wishes he could tear him apart in '98, but now Eiji appears behind him and they both shake their fists. Eiji disappears leaving Billy confused.
In '02 Billy drops the line but Eiji still pops in to leer menacingly. By 2003, both of them have apparently gotten over it.