The Fregoli delusion or the delusion of doubles is a rare disorder in which a person holds a delusional belief that different people are in fact a single person who changes appearance or is in disguise. The syndrome may be related to a brain lesion, and is often of a paranoid nature with the delusional person believing themselves persecuted by the person they believe is in disguise.

A person with the Fregoli delusion can also inaccurately replicate places, objects, and events. This disorder can be explained by "associative nodes." The associative nodes serve as a biological link of information about other people with a particular familiar face (to the patient). This means that any face that is similar to a recognizable face to the patient, the patient will recall that face as the person they know.

The Fregoli delusion is classed both as a monothematic delusion, since it only encompasses one delusional topic, and as a delusional misidentification syndrome, a class of delusional beliefs that involves misidentifying people, places, or objects. Like Capgras delusion, psychiatrists believe it is related to a breakdown in normal face perception.

Derren Victor Brown (born 27 February 1971) is an English illusionist, mentalist, painter, writer and sceptic. He is known for his appearances in television specials, stage productions, photographic memory, and British television series such as Trick of the Mind and Trick or Treat. Since the first broadcast of his show Derren Brown: Mind Control in 2000, Brown has become increasingly well known for his "mind-reading" act. He has written books for magicians as well as the general public. His caricature artwork has received gallery exhibition and is available in a single volume documenting his portrait collection.

Though his performances of mind-reading and other feats of mentalism may appear to be the result of psychic or paranormal practices, he claims no such abilities and frequently denounces those who do. Brown states at the beginning of his Trick of the Mind programmes that he achieves his results using a combination of "magic, suggestion, psychology, misdirection and showmanship". Using his knowledge and skill, he appears to be able to predict and influence people's thoughts with subtle suggestion, manipulate the decision-making process and read the subtle physical and psychological signs or body language that indicate what a person is thinking.

Timothy David "Tim" Minchin (born 7 October 1975 in Northampton, England) is an Australian-British comedian, actor, and musician.

Tim Minchin is best known for his musical comedy, which has featured in six CDs, three DVDs and a number of live comedy shows which he has performed internationally. He has also appeared on television in Australia, Britain and the United States. After growing up in Perth, Western Australia, he attended the University of Western Australia and WAAPA before moving to Melbourne in 2002. His breakout show, "Dark Side", launched him into the public eye, achieving critical success at the 2005 Melbourne International Comedy Festival and the 2005 Edinburgh Festival Fringe.

Minchin has a background in theatre and has appeared in various stage productions, in addition to some small acting roles on Australian TV. A documentary film about Minchin, Rock N Roll Nerd (directed by Rhian Skirving), was released theatrically in 2008 and broadcast by ABC1 in 2009. He is the co-writer of the Olivier Award winning hit musical Matilda the Musical, based on the Roald Dahl book Matilda.