1♠-2NT, 3♣-4♣, 4♥-4NT, 5♥-6NT, all pass.
Before my lead, our opponents explained their partner's respective biddings:
Declarer: "1♠ shows an opening hand with 5+ spades"
Opener: "2NT is GF with spade support"
Declarer: "3♣ minimum opening without singletons"
Opener: "4♣ cuebid"
Declarer: "4♥ cuebid, and no ♦ cuebid"
Opener: "4NT is Roman Keycard"
Declarer: "5♥ shows 2 aces of 5 and trump Q.....!!!
After complete silence for 10 seconds, my partner and I bursted out in laughs together with Opener, whereas it took a little longer for Declarer to realize that he had just invented a new and smooth alternative to the Alcatraz Coup* (even in a NT-contract).
* If you don't know this approx. 50 year old coup, check:
http://en.wikipedia....i/Alcatraz_coup

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