Somebody must have been here before us.
3 seconds sound clip from the The Goonies movie soundboard.
You can hear this line at 00:52:59 in the Blu-ray version of the movie.
Quote context
[...]
- In 3rd grade, I cheated on my history exam.
- In 5th grade, I knocked my sister down the stairs, and I blamed it on the dog.
- Wait, I can't see a thing. What am I stepping on? Oh, brother.
- A lantern! Look, you guys, a lantern!
- Somebody must have been here before us.
[...]