Well, you could have knocked me over with a feather.

4 seconds sound clip from the Meet John Doe (1941) movie soundboard.

You can hear this line at 01:01:10 in the DVD version of the movie.

Quote context

[...]

- Was I burned!

- I turned round to my wife and she said:

- Louder, he didn't hear you.

- So in a voice you could've heard in the next county I said:

- Good morning, Mr. Smithers!

- Well, you could have knocked me over with a feather.

- Old Sourpuss turned around, surprised like, put on a big smile, came over, took my hand like an old lodge brother and said: Good morning, Hansen,

- I've been wanting to talk for years only I thought you didn't like me.

- Then he started chatting away like a happy little kid. Got so excited his eyes...

- Well, before we got through I found out that Smithers is a swell egg only he's pretty deaf which accounts for the noises.

[...]