Often described as the opposite of deja vu , jamais vu involves a sense of eeriness and the observer's impression of experiencing something for the first time, despite rationally knowing they've experienced it before. Jamais vu is sometimes associated with certain types of aphasia , amnesia, and epilespy. Jamais vu is most commonly experienced when a person momentarily does not recognise a word or, less commonly, a person or place, that they know. This can be achieved by anyone by repeatedly writing or saying a specific word out loud . After a few seconds one will often, despite knowing that it is a real word, feel as if "there's no way it is an actual word". The phenomenon is often grouped with deja vu and presque vu ( tip of the tongue , literally "almost seen"). Theoretically, a jamais vu feeling in a sufferer of a delirious disorder or intoxication could result in a delirious exp...