All their windows were dark. No one knew he was there.
5 seconds sound clip from the How the Grinch Stole Christmas! (1966) movie soundboard.
You can hear this line at 00:12:04 in the Blu-ray version of the movie.
Quote context
[...]
- Then he loaded some bags and some old empty sacks on a ramshackle sleigh, and he whistled for Max.
- Giddap.
- And the sleigh started down toward the homes where the Whos lay a-snooze in their town.
- All their windows were dark. No one knew he was there.
- The old Grinchy Claus hissed as he climbed to the roof, empty bags in his fist.
[...]