Things like this can happen all of a sudden.
3 seconds sound clip from the Invasion of the Body Snatchers (1956) movie soundboard.
You can hear this line at 00:37:53.550 in the Blu-ray version of the movie.
Quote context
[...]
- Putting the meter outside on the patio.
- Okay.
- The eggs will be hard-boiled.
- Did you do this for your husband?
- Mm-hmm. Didn't your wife do this for you?
- Well, take my advice and don't get mixed up with a doctor. They're seldom at home.
- What would you say if I told you I was already mixed up with a doctor?
- I'd say it was too good to be true.
- Things like this can happen all of a sudden.
- What's all of a sudden about two people who've know each other most of their lives?
- Good morning. I thought I smelled some coffee. Why didn't you give me a call?
- I didn't want to wake Teddy.
- Oh, she's wide-awake. Got a good sleep.
- Good.
- But I don't feel that she should go home right away, Miles.
- Would you mind taking in a couple boarders for a while? Or do you have something else in mind?
[...]