- You are Mr. Carpenter, who wrote those equations on my blackboard?
- My clumsy way of introducing myself.

10 seconds sound clip from the The Day the Earth Stood Still (1954) classic radio play.

You can hear this line at 00:23:38 in the radio play.

Quote context

[...]

- We sure had fun today. We went all over Washington and went to see Professor Barnhardt.

- Professor Barnhardt?

- Oh, sure.

- Barnhardt?

- Up to bed now. Pronto!

- Is this the man you wanted to see, Professor Barnhardt?

- Oh, thank you. If I may speak to Mr. Carpenter alone, please?

- I'll wait outside, Professor.

- You are Mr. Carpenter, who wrote those equations on my blackboard?

- My clumsy way of introducing myself.

- Forgive the manner in which you were picked up. Hilda called the police before I saw your annotations on the board.

- I appreciate the need for security, Professor.

- I have not quite fathomed the problem, even with your remarkable assistance, Mr. Carpenter.

- Let's look at it, sir. All you have to do now is substitute this expression at this point.

[...]