Recently, while perusing some texts from Europe, I unearthed a piece of magic that seems to be a source of Vernon's "Trick that cannot be explained." It is from a remote section of Germany called Ostfriesland. The name of the trick in German is "der Trick den niemand verstehen kann," or, in English, "the trick that cannot be understood."
This trick is so abstruse that even the effect cannot be fathomed or described.
It involves a pack of cards -- the original called for a 32 card Skat pack -- a goat, three pineapples (which are quite hard to obtain in Ostfrisland), an inflatable ball, a 20 Mark banknote and a pair of audience volunteers.
The description in the old German text translated as "The magician feeds the goat two of the pineapples, which have been marked by the audience volunteers. Next, each volunteer freely selects one of the cards from the Skat pack. The cards are returned to the deck which" and the text breaks off at this point.