Here is a hand that I played with my wife:
Both vulnerable, West deals
North leads K♣️. South and West play small ♣️s.
Should North continue ♣️s at trick two?
North is a bit stuck here with what I call the Bath Coup Dilemma. West is that wily Sammy Krumholz and he might easily have played a small ♣️ from A J x—inviting or daring North to continue ♣️s into his A J. In that case North’s ♣️ continuation is likely to award East/West with an undeserved overtrick. West’s play of small from A J x on a K lead is called the Bath Coup.
On the other hand, South might have J♣️ in which case continuing ♣️s is the best defense.
What is North to do?
