Text:

Hang around the barbershop and you’ll end up with a haircut

Context:

My informant likely learned through American television shows, as the informant moved to America in his teenage years. The informant frequently says this to his children, especially when it comes to warning them about spending too much time with people who are not a good influence. In particular, he uses it to warn his daughters not to spend too much time with guys who would not be a good boyfriend, because he feels that the more time you spend with someone, the harder it will be to not develop feelings or forming a relationship. My informant changes the way he says this phrase occasionally, with the addition or omission of a few words, but the sentiment remains the same. 

Analysis:

The exact origin of this saying is unknown. It is typically used as a form of advice, warning people about the company they keep or the environments they put themselves in. This saying would likely be most appropriate in culture where people are taught to be wary of their surroundings. Barbershops are where men go to get a haircut, therefore going to the barbershop and not getting a haircut is seen as unlikely and illogical. The proverb warns individuals that even if you think you are immune to being influenced or changed by your surroundings, spending more time will increase your chance of such. While the connotation is typically negative or used to scare people, it can possibly be used in a positive manner to encourage persistence at a certain task or goal.