Dear Mary: How can I make my polite English husband interrupt like a German?

Q. My dear English husband has never mastered the knack of timing his interventions in conversation. He hesitates politely, and by the time somebody pauses, his comments are no longer to the point so he shuts up. After 45 years I always know when there’s something he wants to say, and it’s become a sort of party turn that I butt in and call for order for the next speaker — which doesn’t reflect well on either of us. Any ideas, Mary? Should he signal, for example by raising his right forefinger, the hand resting on the dinner table?
— B.D., Frankfurt

A. This gesture is too puny to halt the egotists holding forth. Instead he should employ the method used by traditional English schoolboys of his vintage to signal to a schoolmaster than he has an answer, namely to raise one arm in the air and keep it there till given the chance to speak.