Oh, I forgot to lock the attic door.
4 seconds sound clip from the Beetlejuice movie soundboard.
You can hear this line at 00:18:29 in the Blu-ray version of the movie.
Quote context
[...]
- OKay.
- So?
- Once you cover up the wallpaper, knock down a few walls... this place might just be livable.
- Oh, I forgot to lock the attic door.
- When?
[...]