Bar, taverns and not pubs, which is something different; the place for tapas and drinks, is like the emergency room of a hospital: it becomes gloomy or it becomes lively without anyone being able to foresee it, except at certain times for breakfast, snack time and early coffee.
Not only hunger takes us to bars, there are other more subtle reasons. We really go when we want to satisfy our spirit, either because we need to think or the opposite. A bar is always one's own territory even when we to into one for the first time, though the most important part is to get a place, always the same place, and a friend who just by looking at you when you come in can I appreciate the way you feel that day. The classical bar addict will refuse any seat, he will step on the foot rest and will lean on the bar with his elbow in natural elegance, hiking a strategic corner where he cannot bother anyone and no one will bother him.
The bar tender knows when to come up to him and when to serve at a certain distance; without any questions he will serve the beer or wine with the same calmness as a doctor handing a prescription. A good bar is a bar that entertains the five senses, though taste is the most important.
If one comes out purified from a bar after staying there for the right amount of time, not a minute more, because the bar tender will lose interest in you from that moment on; however, what most bothers him is, when you enter and leave in a stampede, in a hurry between sips and bites.
One can not always choose their company. You have to know how to handle boring people. And when you leave the bar with the unavoidable "friend" you just met, playing to he new friends with the head full of drinks, do not ask him for a business card, because after the last hug you will both be complete strangers. A bar creates this illusion, because in real world there is no one who is able to agree with me for two hours. Remember him as a picture with no name of a while in limbo.
To sum up, a bar exists for us to feel good with ourselves. Its social facet is only apparent.