Locally calling on houses where dangerous people live (creeps, flashers and the like) is avoided. There are very few things that can stop a determined witness though (even watchtower decrees and do-not-call lists). The only restriction I ever saw from Bethel was the ban on white JW's calling on the black servant houses at the rear of white suburban Port Moresby (but being zealous young pioneers, we ignored that anyway).
I'd heard that the Amatyville Horror involved a JW family.