You over slept. The milk in the fridge has turned sour. The dog took a dump on the living room floor. You get in the car and the battery is dead as a door nail. Call for a taxi for a ride to the train station. You arrive five minutes late, and the last morning train to the city has already left. You call your boss to tell him what happened, and he his pissed off.
What to do now that the day has turned to shit? Grin and bear it. Shit happens.