There are five senses that can be scientifically identified, the sense of smell, sight, hearing, taste, and touch. Many have claimed that there is another sense which cannot be defined or identified within the known scientific parameters, it is called the sixth sense. The sixth sense is often referred to as the ability to sense things that go beyond the five senses. For example, animals can sense when a natural calamity is near, or dogs can sense any person’s intent and nature.
This was known as the queueing theory. This theory that Erlang created is the main explanation for why you can never be in the fastest line wherever you are. So it goes all back to probability. If there are five lines at the store and you are in one there is only a one in five chance that you are in the fastest line. Honestly, it's probably just your perceived notion, and it's most likely not actually the slowest.