I read it in a science book.
4 seconds sound clip from the Mrs. Doubtfire movie soundboard.
You can hear this line at 00:25:17 in the Blu-ray version of the movie.
Quote context
[...]
- You know, grown-up problems, they're a little more complicated.
- How is the old battle-ax? Your mom.
- Oh. I'm glad to hear that. I'd hate to think that she came down with amebic dysentery or... piles.
- You don't have to be so graphic with her.
- I read it in a science book.
- Why would you want Mommy to die?
- Oh, honey, I don't want Mommy to die.
- Look, Dad, you're not trying very hard.
- We only get to come here once a week. That's not very much.
[...]