 Polythematic delusions extend to more than one theme, where the themes can be interrelated. Delusions of persecution are very common polythematic delusions. We may believe to be surrounded by alien forces controlling our actions, where the alien forces are slowly taking over people’s bodies including our own. In that case, we have delusions of persecution and delusions of alien control. Typically, these delusions are interrelated and are manifest in the interpretation of most events occurring in our lives. Other examples of delusions that can be polythematic are the belief that we are geniuses but are misunderstood and underestimated by others (grandeur), and the belief that we are secretly loved by a famous or powerful person (erotomania).