Possible Causes:
1. You are sitting of an evening in your back yard. Your neighbor comes down the street in his new Ford V-12 pickup with dual rear wheels, the right-hand set of which collides with, and with an ear-splitting screech crushes, your free-standing mailbox as he turns into his driveway.

2. You are deep in the throes of Wagnerian love-and-death in the soul-wrenching last act of Tristan and Isolde at the opera when your seatmate’s cellphone and beeper go off simultaneously.

3. Languorously sipping your decaf café latte à la Madeleine at an outdoor table at Starbucks, you are enjoying a few moments of intense navel-gazing, when a person at an adjacent table shouts, "FUCK!" as the Starbucks waitperson spills a steaming hot Supersize decaf café latte à los Cojones del Toro in said person’s lap.

Cure:
Proceed to your nearest Walgreen’s, Eckerd’s, Drugs R Us, whatever. In the "Eye-Ear-Nose-Throat" department, you will find an assortment of small conical objects made of various pliable chemicals, designed to be inserted deep into your ears and guaranteed to reduce your perception of ambient noises by a good 40 decibels. Purchase several pairs of these objects. Insert immediately (only one pair of course), and make such insertion a habitual part of your daily morning toilet. You will find that your days henceforth will run off with extraordinary smoothness and lack of irascible reactions on your part.