Yup, I've heard that before. It's a brilliant scene.
"You are wonderful." "Thank you; I've worked hard to become so." "I admit it, you are better than I am." "Then why are you smiling?" "Because I know something you don't know." "And what is that?" "I... am not left-handed." [...] "You are amazing." "I ought to be, after 20 years." "Oh, there's something I ought to tell you." "Tell me." "I'm not left-handed either."
no subject
"You are wonderful."
"Thank you; I've worked hard to become so."
"I admit it, you are better than I am."
"Then why are you smiling?"
"Because I know something you don't know."
"And what is that?"
"I... am not left-handed."
[...]
"You are amazing."
"I ought to be, after 20 years."
"Oh, there's something I ought to tell you."
"Tell me."
"I'm not left-handed either."