Free hair cut
The best way to get one.
Get some clippers and mess up your hair cut,
not to bad because it will need to be fixed so it would help you grew your hair out for a few months before this.
Once you have made it look like shit but not so bad that it cannot be fixed hop in your car and drive to a barbor make sure its a new one ever time.
Once you get in rush up to the counter like you are worried and not bother sighning in just tell him how bad someone down the road just messed up your hair,
once they start cutting on you explain how upset you are and how happy you now are becuase they could help.
When the cut is up ask them how much and beg to pay them,
they most likely wont ask for any money hoping that you will come back for another cut.
Plus all they did was fix your hair not give you a full hair cut.
So theres your free cut.