Well, what makes me the happiest are beautiful women, elegant restaurants, fine wines and Belgian chocolates.
Going out on the ministry is very much like making love to a beautiful woman. You have to prepare well, take your time, stimulate their interest, be gentle but firm. Unzip your book-bag and give them your Watchtower. Keep it going for as long as you can, and always leave them wanting more.
Oh, and always make sure you write down their name and where they live.