Aside from a few misperceptions, i.e. shadows playing tricks on me and what not, I've never had a visual hallucination.
I may have had an auditory hallucination once. Not very long after I was converted I was in a fairly distressed state about things like death and hell. One night while I was wrestling with thoughts about that subject, out of nowhere I heard a strange, small voice say "there is no death." I knew it was in my head because I didn't actually hear it with my ears, but it wasn't my inner monologue either. It was like I could hear it, but I know I didn't think it, because it surprised me.
I have another weird story (l just know I'm going to freak some of you all out, but w/e it makes life interesting). I remember being deeply asleep once years ago, and in my dream state or whatever you want to call it, I kept hearing this rhythmic pattern: three beats, pause, three more beats, pause, and so on. At first it was faint, but it grew louder and louder over time, until I woke up, gasping for breath and I realized it was my own hand smacking me on the chest, and I stopped.
0_0