The video was posted on YouTube by a patron at the Commack restaurant who witnessed an argument between two women turn into a full-fledged fracas that went on for about 2 minutes, ABC and Commack Patch said.
The video showed punches being traded and at least one kid trying to pull a mom away from the action. At least one purse disappeared in the confusion.
And all the while, "Happy Birthday" played in the background.
Police said they were reviewing the YouTube footage as well as surveillance video to help sort out what happened.