These people easily having a far worse day than you

Keys Inside Armored Truck
Once one event puts us into a negative mood we will start to look at all other events from a negative angle. Shortly we will encounter so many negative things just because we are focused on them and as a result we will have a bad day. See You get what you focus on. As the negative events start increasing, at least according to our perception, our day becomes a very bad day. As you noticed the main cause of the bad day was that initial event that led to this negative thinking cycle. See The snowball effect