Who said "That's impossible. Good thing I love a challenge."?

This quote is attributed to Tony Stark / Iron Man.

That's impossible. Good thing I love a challenge. - Tony Stark / Iron Man

"That's impossible. Good thing I love a challenge."

Tony Stark / Iron Man Adventure

"I am Iron Man."

"Genius, billionaire, playboy, philanthropist."

"If you're nothing without the suit, then you shouldn't have it."

"The difference between you and me? I'm not afraid."

"The greatest adventure is life itself."

"The adventure of life begins with a single step."

"Adventure finds you when you stop running."

"Fortune and glory, kid."