Witnessing to Mormons is extremely difficult. I've had many opportunities online (on another message board), as well as a few opportunities face-to-face, and in all cases I've found Mormons to be extremely nice people who are wearing spiritual blinders. The cult of Mormonism is so ingrained in their thinking that the mere mention that they worship a different Jesus, different God, and that their religion is, at best, very loosely based on the Bible, just brings blank stares (in person), or quick changes of the subject (online). Mormon apologists also tend to be militant and sometimes downright sneaky in the way they present their beliefs -- everything is wrapped in scripture, but beneath the scripture is nothing but the Book of Mormon and the words of Mormon "prophets".