You should read the new book Mark Twain's writing now.
5 seconds sound clip from the It's a Wonderful Life (1946) movie soundboard.
You can hear this line at 01:40:14 in the Blu-ray version of the movie.
Quote context
[...]
- Come back here, you drunken fool! Get this car out of here!
- Hey, what's the matter with you? Look where you're going.
- Help! Help! Help! Help! Help! Help! Help! Help! Help! Help! Help! Help!
- Oh, Tom Sawyer's drying out, too.
- You should read the new book Mark Twain's writing now.
- How did you happen to fall in?
- I didn't fall in. I jumped in to save George.
- Well, I did, didn't I? You didn't go through with it, did you?
- Suicide.
[...]