I don't know. If I did know, maybe I'd want to forget.
7 seconds sound clip from the Island of Lost Souls (1932) movie soundboard.
You can hear this line at 00:11:26 in the Blu-ray version of the movie.
Quote context
[...]
- Get it off of there! Overboard with the whole spittin' mess of 'em. Lower away!
- Hey, is that Moreau over there?
- Yeah.
- Say, what is all this mystery about Moreau and his island?
- I don't know. If I did know, maybe I'd want to forget.
- Get up there and clear that line off.
- That's the last of 'em and this is the last time I'll ever put in here for evermore! Amen!
[...]