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The phenomenon that something which was previously working correctly, suddenly does not work correctly when one tries to demonstrate the operation to others.
2013, Konrad Zuse, Der Computer — Mein Lebenswerk, Springer-Verlag, →ISBN, page 204:
Dem Erfinder Zuse kam dieses Glück gelegentlich zu Hilfe, wenn Geräte bei wichtigen Vorführungen wider Erwarten fehlerfrei liefen, und er bekennt freimütig, daß ihm dieser „inverse Vorführeffekt“ öfter geholfen habe.
The inventor Zuse was occasionally helped by this good fortune when, contrary to expectations, devices ran without any errors during important demonstrations, and he freely admits that this "inverse demonstration effect" has often helped him.