Paul Laliberte and I were sitting North-South, with no one vulnerable and East dealing, in an OK Bridge tournament:
    

                                NORTH (Kaplan)
                               ♠️ 8
                               ♥️ K 10 3
                               ♦️ K J 10 2
                               ♣️ A Q 7 6 5
WEST                                                     EAST
♠️ J 10 7 2                                             ♠️ K 3
♥️ Q 7                                                    ♥️ 9 8 6 5 4 2
♦️ Q 7 5                                                 ♦️ A 9 4 3
♣️ J 10 4 2                                              ♣️ 9

                               SOUTH (Laliberte))
                               ♠️ A Q 9 6 5 4
                               ♥️ A J
                               ♦️ 8 6
                               ♣️ K 8 3

The bidding proceeded as follows:
East            South          West           North
Pass            1♠️             Pass            2♣️
2♥️!           2♠️             Pass            3NT  
Pass            Pass            DBL           4♦️  
Pass            5♣️            All Pass

Opening lead: ♥️9

I was fooled twice: first, by East’s silly heart overcall; second by West’s double asking for a heart lead. Panicking, I fled to 4♦️, which partner corrected to  5♣️. Imagine my surprise when I discovered that we held four heart honors!

After winning the opening lead with my ♥️K, I played the ♥️3 to the ♥️A, cashed the ♣️K and led the ♣️3 to the ♣️A, discovering the bad trump break.

Figuring West had at least three hearts, I played the ♥️10 to … West’s ♣️10 ruff. Then West led the ♣️J to my ♣️Q.

I finessed the ♠️Q, cashed the ♠️A, and ruffed the ♠️9 with my ♣️6. Here’s where I lost it. Stuck in my hand, I numbly played the unprotected ♦️K to East’s ♦️A. I managed to ruff the ♥️8 return; but then, I played the ♦️J to the ♦️Q. The defenders also picked up the ♠️J. Down two.

Even if you can find a way to make 5♣️, there’s no reason to be in it: 3NT makes easily with four clubs, three hearts, and two spades. If I let the defenders break diamonds, there’s probably a trick there, too. So why didn’t I leave well enough alone at 3NT?

“If you make a principled decision, stick by it,” Paul said, in advice that extends beyond the bridge table.

Amazing how bridge teachses citizenship in addition to everything else.