And chances are, if they're close enough to see the remote's SSID, "The call is coming from inside the house!"
About a quarter of American households live in multi-unit buildings (i.e., apartments, duplexes, condos, town houses), so only a wall or a floor separates one household from another.
The 2005 census numbers likewise state that for household members (as opposed to households referenced just above) that 69% live in single family detached structures, 6% in mobile homes, and 25% live in attached (e.g., duplex) and apartments within a building.
In some crowded cities, the distance between houses is pretty small--smaller than the width of a typical living room.
So, for many of us (me included), neighbors can be very close even when they are in their own residence.