Your exotic vacation has been great. You have a few days left on the beach, and one day decide to do something different: get hair braids.
The lady offering the services is friendly, and the deal is on, as she might say “it will cost you around $50”. She gets to work, but when she is done asks for $100! She claims she did 50 braids and she charges $2 per braid. If you don’t want to pay, out of the blue two or three mean-looking “muchachos” will come to collect.
How to avoid: set up the price per braid beforehand. Negotiate all the details before she starts working on it. Don’t be afraid to ask her to repeat out loud the agreement.