There’s a subtler but no less iconic self-identification from the same movie:
Top of the world, ma!
Well, since we’re doing different incarnations of that Time Lord guy,
“I am the Doctor. Basically, run.”
In the comics, Wolverine’s signature line is,
“I’m the best there is a what I do, but what I do best isn’t very nice.”
Which occasionally gets parodied,
“I’m the best there is at what I do, and what I do best is guzzle bee—uh, commit mayhem!”
"I’m just a girl, standing in front of a boy, asking him to love her.”
“I’m Bart Simpson. Who the hell are you?”
“I’m not Fat, I am Big-Boned.”
“Meesa called Jar Jar Binks! Meesa your humble servant!”
I am Hugh.
You are me?
No, I am Hugh.
I’m 'enery the 8th I am.
'enery the 8th I am, I am.
“We are the Borg. Lower your shields and surrender your ships. We will add your biological and technological distinctiveness to our own. Your culture will adapt to service us. Resistance is futile.”
Often corrupted to:
“We are the Borg. Resistance is futile.”
OK, if we’re going Star Trek…
“You don’t understand. I could’ve had class. I could’ve been a contender. I could’ve been somebody, instead of a bum, which is what I am. Let’s face it.”
–Marlon Brando as Terry Malloy in On the Waterfront
Do songs count? Then I’ll offer:
I’m so fucking sick
I’m the king of the world
I’m the genius of
Useless stuff
“No anchovies? You’ve got the wrong man. I spell my name - Danger.”
“I have come here to chew bubblegum and kick ass…and I’m all out of bubblegum.”
“Rowdy” Roddy Piper as Nada in They Live
I am the eggman, (whooo!)
they are the eggmen, (whooo!)
I am the walrus, goo-goo g’joob
I’m bored!
I’m the chairman of the board!
I’m sick!
“My name is Ozymandias, king of kings:
Look on my works, ye Mighty, and despair!”
Percy Shelly