Don't you understand? Don't you understand it's funny?

— Jimmy (Dick Powell)

5 seconds sound clip from the Christmas in July (1944) classic radio play.

You can hear this line at 00:07:28 in the radio play.

Quote context

[...]

- You guess so, what's it mean?

- It's the bunk.

- Yes. But do you get the play on words?

- Oh Jimmy, you don't need a play on words.

- Any time anybody tells you that coffee makes you sleep you don't need a play on words to know it's the bunk.

- Don't you understand? Don't you understand it's funny?

- It means if you don't sleep at night, it isn't the coffee that keeps you awake, it's the bunk! ...The bed! The bed!

- With me it's the coffee.

- Ooh!

- Oh Jimmy, you know I want you to win. I'm just as anxious as you are.

- And gee, when you lose this one, just think how much better your chances are on the next one.

- Fine chance anybody's got at winning anything if everybody goes around saying coffee keeps you awake.

[...]