I am adult and not weird but i do not answer the door - I did at previous houses but not here.
Here... no cold caller accepts NO as an answer and i usually have to shut the door while they are at mid-sentence ignoring my NO. And dont think I say NO just once! Some of them are extremely intimidating - not nice people at all. Sometimes they come round in pairs!!!!
As soon as the frosts stop we get them all calling - charities, religious callers, quotes for this and that, fishmongers, make up, kitchen knives, tea towels, and about another 100 or so dodgy cheap products that they think is the best thing since sliced bread and to be frank i am sick of it, sick of saying NO, sick of being ignored saying NO. And dont get me started on the scrap collectors who dont even knock but quickly scan and walk round the garden to see what you got.
We didnt have a sign but we have one now that simply says "no cold callers we do not answer the door" because we have had ones that try the door handle, and one man decided to return within half an hour (wont go into detail but he was slightly suprised to find angry me at the door shouting when he thought the place was empty).
If its a friend or neighbour I would see them walk past the front room window and give them a big wave and run to the door to let them in. Thats because I am a nice person - i just dont want my day frustrated by people ignoring No!
But I always open the door for the postman, any couriers (even if not expecting a parcel and its for across the road) and of course emergency services etc. I even make brews for work crews that continuously dig up our road..... mmmm maybe they dig it up all the time because they know they will get a brew from ours!
So if you are someone who goes knocking door to door, or in your job you have to knock on someones door and they dont answer, but you know they are in.... pop a note through the letterbox - there is probably someone like me inside who would love to help but these days doesnt really feel safe opening the door to a strange face.