Hallucinations involve perceiving sensations that aren't real. Hearing voices is the most common hallucination in people with schizophrenia. The voices may comment on the person's behavior, insult the person, or give commands. Other types of hallucinations are rare such as seeing things that aren't there, smelling strange odors, having a "funny" taste in your mouth, and feeling sensations on your skin even though nothing is touching your body.