The customer moves to pick up a chair following this exchange, but apparently thinks the better of it based on the current situation and how she had fared in her previous outing against the quick-service restaurant staff, being disarmed and disabused of this notion quickly.
Moments later Chavolla, 24, charges out from behind the counter, ignoring a milkshake thrown at her head and a blow to the face from a metal tray, and begins brutally beating Fontelar in a video seen millions of times around the world.
Ms Dayag originally posted two videos, one showing events leading up to the fight, including the customer aiming a French fry at the employee.
The McDonald's worker quickly gains the upper hand, slapping the woman as she holds her against a raised platform, before hurling her against a table with such force her tube top falls down.
Dayag was quick to point out that she was not involved in the fisticuffs, merely acting as a bystander to the physical action and was unknown to any of the customers or staff involved.More news: Plane crashes in northern Mexico after takeoff, everyone survives
"So this happened at McDonald's. the lady asked for a water cup and supervisor shut down the soda machine because she wasn't letting her get a free soda". However, when it comes to any escalating situation, self-defense expert Gabrielle Rubin tells Yahoo that.
I don't know about you but I've never wanted McDonald's that bad.
"I wasn't even going to hit her".
Above all, it's important to do what you can to try to calm down the situation, if you can.
If you answered yes, you might want to consider next time that someone could be watching.More news: NASA’s TESS Spacecraft Begins its Search for New Worlds
Marie Dayag, the customer that captured the footage, said the fight started over a free soda.
"It's hard to not mimic behavior; meaning, if someone attacks you, it's normal for you to want to turn around and respond physically", Rubin says.
"There was nothing on them (my fists), just that".
Yahoo has contacted McDonald's for comment.More news: Zinedine Zidane would be Man United's top choice to replace Mourinho