A Bastardized Example

A K 3
6 5 3
K J 10 2
K J 2
Q J 9 7 5 10 8 6 4
2 J 8 4
8 A 9 5 4
8 7 6 5 4 3 10 9
2
A K Q 10 9 7
Q 7 6 3 Opening lead: 8 of diamonds
A Q Vul: N-S

NorthEastSouthWest
1 Pass 1 2 NT
Dbl 3 4 * Pass
4 Pass 4 NT* Pass
5 * Pass 6 Pass
PassDblAllpass * Alerted

I must confess that when I came back to this (I'm editing all entries as time allows), I found I had the same spiel as on the preceding illustration, in addition to the same opening lead (the A of clubs, which opening leader doesn't hold). So I'll hafta wing it a little bit. No, this isn't a prime example of the Lightner double, for it works only because of West's singleton, which East has no way of knowing about. Suppose both had bid diamonds? Could East then not have drawn that inference?
Oh, you might say it would have been a reasonable inference. But South never mentioned his fit in diamonds, and East lucked out, I would say, just as an earlier East, with a ruffing potential and an ace fell flat on a reasonable Lightner when declarer could ruff the ace. Well, you can't win 'em all. And did West obey the conventional dictum and lead a diamond? Ah, me, this hand has gone to bridge heaven, for I have no recollection of it and apparently entered it for whatever lesson it might offer and then forgot to chat it up a bit. But the hand and that bidding did occur, for I can assure you, it's far easier to come across interesting situations than to create them, and all hands on this web site occurred.