This is why you don't make an enemy of the person who cuts your hair. 

There are few profession who hold as much power over people as barbers do their clients. Lawyers, doctors and cops are the three professions that come to mind when thinking about people you don't want to tick off. And barbers should be added to that list because they can and will ruin your life if you give them a reason. 

It's not that they hold your head in their hands (literally speaking), but that they know your gossip and can out you on a dime if you refuse to tip or cheat on them with someone else. 

So let these haircuts be a reminder, always tip your barber.