The Pauli effect or Pauli's device corollary is the supposed tendency of technical equipment to encounter critical failure in the presence of certain people. The term was coined after mysterious anecdotal stories involving Austrian theoretical physicist Wolfgang Pauli, describing numerous instances in which demonstrations involving equipment suffered technical problems only when he was present. The Pauli effect is not related to the Pauli exclusion principle, which is a bona fide physical phenomenon named after Pauli. However the Pauli effect was humorously tagged as a second Pauli exclusion principle, according to which a functioning device and Wolfgang Pauli may not occupy the same room. Pauli himself was convinced that the effect named after him was real. Pauli corresponded with Hans Bender and Carl Jung and saw the effect as an example of the concept of synchronicity. Background Since the 20th century, the work in some subfields of physics research has been divided between theorists and experimentalists. Those theorists who lack an aptitude or interest in experimental work have on occasion earned a reputation for accidentally breaking experimental equipment. Pauli was exceptional in this regard: it was postulated that he was such a good theorist that any experiments would be compromised by virtue of his presence in the vicinity. For fear of the Pauli effect, experimental physicist Otto Stern banned Pauli from his laboratory located in Hamburg despite their friendship. Pauli was convinced that the effect named after him was real. He corresponded with Carl Jung and Marie-Louise von Franz about the concept of synchronicity and did so as well with Hans Bender, lecturer at Freiburg university Institut für Grenzgebiete der Psychologie und Psychohygiene, the only parapsychology chair in Germany. Jung and Pauli saw some parallels between physics and depth psychology. Pauli was among the honored guests at the foundation festivities of the C.G. Jung Institute in Zürich 1948. A famous Pauli effect at the ceremony— as he entered, a china flower vase fell on the floor without any obvious reason—caused Pauli to write his article "Background-Physics", in which he tries to find complementary relationships between physics and depth psychology. Anecdotal evidence An incident occurred in the physics laboratory at the University of Göttingen. An expensive measuring device, for no apparent reason, suddenly stopped working, although Pauli was in fact absent. James Franck, the director of the institute, reported the incident to his colleague Pauli in Zürich with the humorous remark that