The altercation was caught on video early Tuesday morning at the Liverpool One location of the fast-food restaurant, the Liverpool Echo reports.

The customer allegedly became upset after being told he couldn’t order nuggets because the menu had already changed over to breakfast, according to the Echo.

The incident occurred at around 4:50am.

* Warning — this video contains explicit language

In the footage, the restaurant employee and customer are seen in a scuffle as two other customers try to pull them apart. The employee then headbutts the customer, losing his festive reindeer antler hat in the process.

The fight escalates from there as the customer tries to punch the employee in the face, knocking his glasses to the floor. Another employee then steps in, attempting to stop the fight without success.

A source told The Daily Mail there was no security in sight and one of the men in the fight was covered in blood.

A McDonald’s spokesman told the Echo: “We take matters like this extremely seriously and can confirm the individual has been suspended. An internal investigation is taking place as a matter of urgency.”

Local police said the incident had not been reported to them.