Tony Stark: I think we need to look at the arc reactor again.
Obadiah Stane: The arc reactor? That's just a publicity stunt! You built it just to shut the hippies up! There's no way you can make it smaller, let alone cheaper to operate... right?
[pause]
Obadiah Stane: Show me.
Tony Stark: Who told you about it? Rhodesy? Pepper? Okay, was it Rhodesy?
Obadiah Stane: Show me!
[Tony reveals to Obadiah the arc reactor in his chest]