THIS is the terrifying moment a teen thug presses a machete into a boy’s neck at a McDonald’s restaurant.

Four teenagers have been arrested over the machete madness, which was followed by a vicious punch up in the toilets of the fast food chain in Melbourne, Australia.

The saga was filmed on a mobile phone, and the footage is shocking.

It shows a group of teens jostling in the toilets when one, wearing a yellow t-shirt, whips out the evil blade.

He hands it to a pal who forces the victim, wearing a blue t-shirt, to his knees.

While the lad is down, the wielder presses the foot-long knife horizontally into his neck – but thankfully appears not to slice him.

He then taps him twice on the neck, yelling out threats all the while.

A later clip shows two of the teens fiercely pummelling each other with a flurry of fists.

One lad is punched to the ground, but the yellow-t-shirt teen keeps raining down with blows.

The lawless behaviour happened inside a McDonald’s toilet on Monday afternoon in the Truganina area of Melbourne.

Victoria Police believe up to five teens could have been involved in the assault, but they have arrested four and only two were charged.

A spokesperson said: “One of the boys has been charged with aggravated burglary, theft of motor vehicle, false imprisonment, producing child abuse material, assault with a weapon and possessing a controlled weapon.

“He was bailed to appear at a children’s court at a later date.

“A second boy is expected to be charged on summons.

The two victims of the chaos were both 15-years-old, and neither of them were injured.

A wave of knife crime has plagued Victoria – prompting the local government this week to usher through a ban on the sale of machetes across the whole state.

Premier Jacinta Allan announced the measure following advice from police on the same day as the McDonald’s mayhem.

She said: “In Victoria, community safety comes first. We must never let places we meet become places we fear.

“I hate these knives, and I will keep introducing as many laws as it takes to get them off our streets, out of our shops and out of our lives.”

The law was meant to come into force on September 1, but was brought forward in light the recent spike in incidents.