throughout my working life ive had various jobs that involved going to see all manner of people in their own homes.
For some reason my 6th sense could tell me when it was a JW household.
I dunno what it was--the absence of tobacco smoke ? Cheap second hand furniture ? Or maybe it was the Watchtower calendar on the wall ( do they still have those ? ). It might have been all those colourful bound books on the bookshelf ?