Yuck. I haven't eaten Pizza Hut since the one in North Carolina called my SgtMaj and asked him to make me stop talking bad about them online. Haven't eaten there since, and that was 2009.
I had a girlfriend who used to play paintball with me on weekends. Actually had the police called on us because they thought she was being beaten from all the bruises and welts on her.
My correct response is to answer the door with my handgun in my hand and calmly tell them I'm not interested. Usually don't have too many repeat visitors.