If not calm, postpone. Offer to discuss a solution later. Take a deep breath. Arrange for a specific time to discuss the matter. Watch your tone.
Tone has a significant impact on escalating and defusing.
Humor can backfire. Ignore the outburst and focus on the solution. Begin coping with the anger as soon as possible, but do so very cautiously. Set an appointment. This will permit you to use the intervening time to defuse and arrive at a solution.