Ursula and Sabina Eriksson (born 1967) are Swedish twin sisters who came to national attention in the United Kingdom in May 2008 after an apparent episode of folie à deux (or "shared psychosis"), a rare psychiatric disorder in which delusional beliefs are transmitted from one individual to another, which resulted in a series of bizarre incidents on the M6 motorway and the subsequent killing of Glenn Hollinshead of Fenton, Staffordshire. There was no evidence that drugs or alcohol were involved in the incidents on the M6 or the death of Hollinshead.