Having visual/auditory disturbances or having visual/auditory disturbance that were insightful, if not outright prophetic.
On a related note how many mild hallucinations would you need before you went to a psychiatrist?
Personally I think it’ll take 4 more before I go to a shrink 
Do you mean to tell me hallucinations are not normal? You can go to your shrink if you want to, but I LIKE my hallucinations and delusions! 
I would get more disturbed by just plain old images with no realtion to reality.
I’ll ignore audio/visual private shows forever… when my sence of touch starts reporting incorrectly I see a therapist.
I’d say prophetic ones would be more disturbing, as they would force me to reconsider all my ideas about how the universe works.