Never meddle with an angry Bobby

Officer Garroway was gazing at Mrs.Waddington with an eye from which on of New York's Bohemian evenings had wiped every trace of its customary mildness. So intense, indeed, was the malevolence of its gleam that, if there had been two such eyes boring into hers, it is probable that Mrs. Waddington would have swooned. Fortunately, the other was covered with a piece of raw steak and a bandage, and so was out of action.

"Ah"! said Officer Garroway.

There is little in the word "Ah" when you write it down and take a look at it to suggest that under certain conditions it can be one of the most sinister words in the language. But hear it spoken by a policeman in whose face you have recently thrown pepper, and you will be surprised.

(from The Small Bachelor, by Sir Pelham Wodehouse)