"Hey, I'm Dr. Rodney McKay, all right? "Difficult" takes a few seconds; "impossible," a few minutes."
"But I'm a Battle Schooler. We had classes in doing the impossible. I got A's."
Ambul, Shadow Puppets
The Doctor: It's impossible!
River Song: How impossible?
The Doctor: Two minutes.
"We the unwilling, led by the unknowing, are doing the impossible for the ungrateful. We have done so much with so little for so long, we are now qualified to do anything with nothing."
"The word 'impossible' is not in my dictionary."
Phineas: Can we help?
Lawrence: Well, I'm afraid not, unless you can perform miracles.
Phineas: ...what's your budget?
— Phineas and Ferb, "Dude, We're Getting the Band Back Together"
"Do the impossible, see the invisible / Row, row, fight the power!"
"This isn't Mission Difficult, Mr. Hunt. It's Mission Impossible. Difficult should be a walk in the park for you."
Swanbeck, Mission: Impossible 2
"If you've done six impossible things this morning, why not round it off with breakfast at Milliways?"
"The difficult I'll do right now/the impossible will take a little while"
Billie Holiday, Crazy He Calls Me
"Impossible is not a fact. Impossible is an opinion."
"Impossible is our stock in trade, and success is what we deliver."