X-Men 3, aka X-Men: The Last Stand, is widely viewed as the worst entry in the franchise (or was, until Dark Phoenix), and is really only memorable for one moment in the final act when Juggernaut (Vinnie Jones) is chasing down Kitty Pryde (Elliot, then known as Ellen, Page).
As the seemingly unstoppable villain is closing in on the young mutant, she uses her abilities to phase him through the floor. Juggy then looks up angrily at his foe, and says: "Don't you know who I am? I'm the Juggernaut, bitch," before bursting free and resuming the chase.
The line was inspired by a parody dub video of the '90s X-Men: The Animated series that was created in 2005 by Randy Hayes and Xavier Nazario of My Way Entertainment, and went on to spawn numerous memes. The dialogue always seemed out of place in the movie, and co-writer Simon Kinberg has now revealed that it wasn't actually part of the final script he submitted with Zak Penn.
During an interview with Polygon, Kinberg confirmed that director Brett Ratner added the line after principal photography had already wrapped: "The real [story] on that is that was a reshoot Ratner line."
Ratner took over when original director Matthew Vaughn left the project over creative differences, and it sounds like it would have been a very different film had he stayed on board.
"With Matthew, it was a major departure from Bryan Singer, who had directed the first two movies," Kinberg continues. "Matthew himself is a world builder — or maybe more than a world builder, a tone builder. He wanted to do something tonally very different than the previous two films. And so we were really in the script phase, even through pre-production, because Matthew was aboard for a long time.
And so it felt like, even though we weren’t creating an entirely new universe, because Bryan had obviously done an amazing job of building the foundation with the first two films, and all of those decades’ worth of incredible comics, we were creating a new tone within that world and new rules. I think you saw that tone in X-Men: First Class. But it was a real sci-fi sandbox."
Disney acquired the rights to Fox's assets back in 2017, and a Marvel Studios X-Men reboot is planned (though it's been a long time since we had any solid updates).
The upcoming Deadpool 3 is expected to bring back a few Fox era characters (in addition to Hugh Jackman's Wolverine), however, and will hopefully serve as a better farewell to the original big-screen incarnation of the team than Dark Phoenix.