He just couldn't get it out of his head.
4 seconds sound clip from the Before Sunrise movie soundboard.
You can hear this line at 01:15:26 in the Blu-ray version of the movie.
Quote context
[...]
- But then the morning comes and we turn into pumpkins, right? I know.
- But at this time, I think you're supposed to produce the glass slipper and see if it fits.
- This friend of mine had a kid, and it was a home birth, so he was there helping out and everything.
- All he could think about was that he was lookin' at somethin' that was gonna die someday.
- He just couldn't get it out of his head.
- You don't think we'll ever see each other again?
- Well, gosh, I don't know. I mean, I hadn't planned another trip to...
[...]