My mum has a trick for instant calm, passed down from her mother and her mother before that.
It works better outside or in a barn, but there’s plenty of ways to replicate it in modern life:
When you’re angry, dunk your head in a bucket of ice-cold water.
If no buckets are available, a tap or hose to the back of the neck works just fine. It’s possible to be disgruntled after a cold shower, but almost impossible to be angry.
For added effect, dip your toes in too. They can be hot, angry little fellas, but they do love a cold swim.