This is one of those situations where an example of consumers behaving badly turns into consumers behaving really, really badly. Police say a group of customers who complained about two women having sexual relations in a McDonald’s bathroom then attacked the couple after a manager threw them out of the restaurant.

A group of customers went to a manager on Wednesday afternoon and claimed that there were two women engaging in inappropriate behavior, reports Philly.com. Because while getting busy is fine and all, no one should (allegedly) be doing so in a public restaurant.

The manager went to the bathroom and told the women to leave, say police. Shortly after they’d done so, according to cops, the group of seven or eight people who had reported the couple ran outside and began assaulting the two women.

One woman was stabbed in the shoulder with an unknown object by a woman who had two kids with her, police said. During the incident, the couple reported that their attackers used derogatory language.

The crowd finally broke up when cops arrived on the scene, and officials convinced the stabbing victim to go to the hospital. She was treated for her injuries and released. The police are reviewing surveillance videos from inside McDonald’s to identify the people suspected of attacking the couple.

As a reminder, here is what you do at restaurants, fast food joints — anywhere you go to eat: You order your food, you pay for your food, you sit down and eat your food, talk to your friends and loved ones, perhaps visit the facilities to answer the call of nature, throw out your garbage and leave. The lesson here? Even if a fellow customer does something you take issue with, for the love of humanity, violence is not the answer.

Cops: Sex at McD’s gets women kicked out, jumped [Philly.com]

Want more consumer news? Visit our parent organization, Consumer Reports, for the latest on scams, recalls, and other consumer issues.