Yes, you ought to be, definitely. But, you know, to be frank, I should be a little ashamed too because I tricked you just as you tricked me.

14 seconds sound clip from the Champagne for Caesar movie soundboard.

You can hear this line at 01:22:26 in the DVD version of the movie.

Quote context

[...]

- Thank you, I did the worst I could.

- Yes, I'm sure you did.

- I remember the night you arrived. When I laughed in my sleep?

- Yes, it twisted my mind.

- It was effective, wasn't it?

- It was delicious agony.

- Were you also pretending when I kissed you?

- Oh, you're wonderful. I'm ashamed of myself.

- Yes, you ought to be, definitely. But, you know, to be frank, I should be a little ashamed too because I tricked you just as you tricked me.

- You see, I became a little suspicious, your timing was too good, your scenes too perfect and your confessions too pat.

- You mean that I didn't drive you mad? Oh yes, yes, of course you did.

- I fell in love with you madly, despise my suspicions, but nevertheless I...

- Do you mean that you purposely let me know about your weaknesses for Einstein's theory?

[...]