PMS

If left alone, it begins to simmer. Little annoying things add to the simmer transpiring into boiling resentments. But the top are left on to contain the steam from the cauldron.

Indirect provocations adds to the boil, the top dancing a bit to stopper some of the vent.

Actual face to face chat. Snarling and temptation to bite is constrained under a film sheen of extreme politeness.

Person makes a funny comment. Top dancing halts. Boiling transcends into simmer. There is now a stillness of exhausted hot water.