Because Dale refuses to give up his office drum set that means that, Brennan, you and Dale are gonna have to share a room.
10 seconds sound clip from the Step Brothers (2008) movie soundboard.
You can hear this line at 00:11:56 in the Blu-ray version of the movie.
Quote context
[...]
- All right. Brennan, it's okay. It's okay.
- All right, just Look, you know what? Hey, guys.
- Okay, sleeping arrangements. It's gonna be different...
- Mom, we didn't talk about this.
- Well, it's gonna be an exciting adventure.
- You wanna show him the room? Show him where he can put his stuff?
[...]