At the center of one of the strangest criminal incidents in recent memory are Ursula and Sabina Eriksson, a pair of Swedish twins whose bizarre behavior was captured on CCTV and subsequently featured in a BBC documentary called Madness in the Fast Lane. After being thrown off a National Express coach (bus) to London for acting suspiciously and refusing to allow their bags to be checked, the pair were seen walking down the central reservation of the M6 motorway. What happened next has led to the formation of all sorts of wild theories about their true nature. The most common is that they are products of a modern European variant of the infamous MK-Ultra Project. Hard facts about the case are hard to come by, but at least two are not in dispute: 1) No drugs were found in their systems, 2) Neither had exhibited any symptoms of psychosis prior to this episode. The only official explanation rests on a rare psychological diagnosis called “Folie à deux” or shared psychotic disorder.