Going door-to-door is such a humbling experience, you meet so many interesting people, hear so many interesting things. Some really sad stories, some really happy stories, met a lady the other day that wants to have Bible studies, really seeking for truth. Doesn't have the best home life etc.. so keep her in your prayers!
Also, we had our first Bible study in USA with an elderly lady who is a Christian Scientist. It went really great, she wants to study the Bible with us again next sunday!