Wow. I thought she was going to get seriously hurt there for a couple of minutes.

A BRUTAL video of a McDonald's worker beating up a female customer who apparently "disrespected" her mom surfaced yesterday.

The McDonald's employee got into a brutal fight with a customer as she tried to fill up a water cup with free soda in Las Vegas in the US on July 26. McDonald's later said it is investigating the incident and "does not condone the behavior depicted in the video." You can hear the customer scream something about the worker's "mama" and that set her off all over again.

Check out the video: