Although I have lost a part now and then, it's very rare. But I have certainly been affected by the aura of 'Ping !'.
That's the strange, mysterious force which, when one is in the middle of a delicate operation in modelling, normally involving a small part which will be difficult to scratch-build, suddenly, and for no reason known to man - 'Ping !' - and said part disappears, never to be seen again !