When I lived in San Diego, I lived next to a Mormon elder. Very nice guy, and as it turns out, very handy because all the Mormon missionaries would come to his house and he would fix their bikes (which is why I am not a Mormon elder, because I am not very handy).
Because of that, we always had plenty of visits from Mormon missionaries. I would rarely turn them away without at least talking to them for a few minutes and sometimes would even invite them in and we would debate Christianity over lemonade. I enjoyed it because it challenged me to be able to defend my faith, and learn how to debate without being obnoxious. (I'm still obnoxious, just not when I debate someone).
Well, last Saturday there was a whole carload of Jehovah's witnesses unleashed on our neighborhood. I talked to an older man that owns some hearing aid businesses in New Braunfels for about 40 minutes. Again, very nice man and we had a good conversation. Unfortunately, I was very rusty on my Jehovah's witness theology, but I did manage to ask him some questions that he couldn't answer. So, he is coming back this Saturday, I'm sure with reinforcements.
As I have been reading up on their religion, I came across this video and thought it might be helpful if you want a short synopsis of their history and what they believe...