I know of only one triple pun that is also an accurate touché. A visitor who came in upon the wife of Sir Herbert Beerbohm Tree while she was giving her daughter a geography lesson, asked the child: ‘What is the capital of the Rothschilds?’ Answered the mother: ‘Bering Straits.’ (The Baring family, it is perhaps permissible to add, were the great rival English bankers.)
— Louis Kronenberger, The Cutting Edge, 1970