-smell of veggie stir fry from the kitchen
-the theme song of the show they are currently bingewatching on netflix
-the sound of the shower turning on
-silverware that was on the counter the night before is now gone
-a new toilet paper roll is on the holder
-hip hop music filling the room
-the trash is more full than when you last checked
But it’s kind of hard to know for sure when you haven’t seen them yet.