Or it might be someone from a few doors down with some badly delivered mail, a courier with a parcel your partner/roommate ordered or a new neighbour introducing themselves, someone felling you theyre having a party and would appreciate you not calling the cops at 10pm.

I get maybe 4 sales knocks a year, I just say not interested and close the door!

I knocked on my neighbors door with some beers to say hello when I was hanging out with nothing to do just the other day. Nice to meet new people.