(I'm standing in my room when my cell phone rings)
Me: (upon recognizing that it is my own house calling) Hey.
Roommate: Hey, are you home?
Me: Yup. I'm in my room.
Roommate: Oh, good. 'Cause we thought you weren't home yet and we knew you didn't have your key and the door is locked.
Me: Nope, I'm here. I'm the one who shut off the downstairs lights and locked the door.
Roommate: (laughs) Ok, we just thought we'd check as we hadn't heard you come in yet.
Me: No problem. Oh, hey, are you done in the bathroom? 'Cause I want to take a shower.
Roommate: (laughs) Yeah, the bathroom is all yours.
Roommate: Ok, well, goodnight.