1NT was 12 to 14, and 2♣ was alerted, asked, and described as "Landy". It also says "Landy" on both SCs. Landy is quite well known over here: 2♣ shows both majors, other bids are natural in defence to 1NT.
The defenders asked after dummy had been revealed, and were told that sometimes they used "Landy" with a major and a long minor, bidding the long minor if partner bids the wrong major.
East felt he had been talked out of a heart contract. He pointed out that if he had bid 2♥ over 2♣ when it was described as "Landy" his partner would have taken it as better hearts than spades, fishing for no-trumps. His partner agreed. East thought 4♥ unambiguous, but silly with a known four card suit on his right.

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1NT 2♣! P 2♠
P P P
Result:
2♠/S +2
NS +170