- Yes, I saw several U.M.O.'s years ago in London.
- You mean during the war?
- No, when I was a very young actor, but the flying objects were later identified as ripe tomatoes and eggs and cauliflower.

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

You can hear this line at 00:53:59 in the radio play.

Quote context

[...]

- Pepsodent's new flavor! Pepsodent's new flavor! Wow! Pepsodent's new flavor! And a clean-mouth taste for hours!

- And now, here's Mr. Cummings with our stars.

- And here they are, after two out-of-this-world performances, Michael Rennie and Jean Peters.

- Mike, have you ever seen any U.M.O.'s?

- What's a U.M.O.?

- An Unidentifiable Moving Object.

- Yes, I saw several U.M.O.'s years ago in London.

- You mean during the war?

- No, when I was a very young actor, but the flying objects were later identified as ripe tomatoes and eggs and cauliflower.

- Well, how about you, Jean? Seen any flying saucers?

- Oh, actresses aren't interested in such things. We prefer 'King of the Khyber Rifles.' After all, who cares about spacemen when you can see Tyrone Power and Michael Rennie in their latest picture? Co-starring with Terry Moore.

- Or Marilyn Monroe, Betty Grable, and Lauren Bacall in 'How to Marry a Millionaire'?

- And both these Twentieth Century-Fox pictures are in Technicolor and CinemaScope.

[...]