South was declarer in 3NT and with 4 cards left and in dummy, she called "Club". East/West had no clubs. Dummy, correctly, played the 5, and Declarer immediately said "No, I meant the Jack!". Director was called.
By playing the 5, Declarer makes only 2 tricks as she then gets stuck in dummy when she plays the club back to the Jack.
I felt that this was a case of "except when declarer's different intention is incontrovertible" - albeit extremely sloppy, careless play. I ran this scenario past 4 very experienced directors at a National event last week and only one would have allowed Declarer to change from the 5 to the Jack.

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