"Brooding on the objects of senses, attachment to them is formed; from attachment, desire; from desire, anger arises."
Modern explanation
In the middle of the day, return to this: Anger is the last link in a chain that started with quiet rumination. Catch the chain earlier.
Practical application
Before responding to the thing irritating you, draft your reply, wait ten minutes, then re-read it.
Reflection question
What boundary is this anger asking me to set, calmly?