"You Are Right"
As a young man he found a simple way never to be angry, and he shared it with his kallah before the wedding.
Rav Shlomo Zalman once confided to Rav Meir Goldvicht that as a young man he had a short temper. When he became engaged, he asked his kallah to back him in a plan to keep anger out of their home, whatever the plan turned out to be. She agreed. Only after the chuppah, in the cheder yichud, did he reveal it: whenever they disagreed, she would be the one who was right. He said this with a twinkle in his eye. It was no passing joke. The method held for fifty-four years, and at the Rebbetzin's levayah he said that the custom is to ask the departed for forgiveness, yet no moment in their marriage had ever called for it. Anger, in his view, is not tamed by resolve in the heat of the moment. It is tamed by a decision made calmly, ahead of time, together.
Source: Rav Hanoch Teller, And From Jerusalem His Word (Feldheim), a selection of which appeared in Jewish Action under the title "Gentle Giant"
Think of the topic that most often makes you sharp at home or at work. On a calm day, agree with the person involved on a simple rule for the next time it arises: who has the last word, a pause of one minute, or a phrase that means let us come back to this later. Then keep it even when you feel certain. A decision made in advance, with the other person's consent, protects both of you when emotions run high.