Most people have been aware of hallucinations. But what you might not know about it something called negative hallucinations. Of course, hallucinating signifies experiencing stuff that don't actually exist. Like perhaps some ghost from the movies, or some kind of babbling post office container. But destructive hallucinations are when something is genuinely there, but we can not see it. Like the jar of peanut butter you promised was in there. Or the cat food you forgot to obtain. Or those signs that sweet girl over there is flashing at you. The following video clip is quite a great explanation.