Lady Churchill and Sir Winston Churchill were at a function. The hostess noticed that a visiting diplomat, at the function, had secretly pocketed some silverware. It may have been a salt cellar. She was at a loss what to do and quietly asked Lady Churchill for advice. Lady Churchill said she would ask Winston.
This is what Churchill did.
He found a piece of similar silverware and put it in his own pocket. Then, when he got the chance, he went up to the diplomat and quietly showed him the piece of silverware in his pocket and whispered “somebody has seen us taking the silverware so we’ll both have to put them back”.
The diplomat then quietly put back the salt cellar.
This really showed that Sir Winston Churchill was a master diplomat.
Source: I think in a book about Lady Churchill.