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In a clip that has gone viral on social media, viewers have been cheering in delight for the underdog.

The footage begins with the bigger lad, in a grey hoodie, shoving his victim into an awards cabinet in an unnamed high school in the US.

A crowd begins to gather around as the pair continue to tussle, with the bigger student pinning the smaller to the wall.

But seconds later, the young student proves that size really doesn’t matter.

He wriggles free from the bigger lad’s clutches before swinging a lethal right hook towards his face.

(Image: FACEBOOK)

The lad goes flying to the floor as astonished onlookers are stunned into silence.

After pummelling his attacker several times a school security guard steps in to pull the smaller student away.

Thousands of people have been viewing and sharing the clip since it emerged on Facebook earlier today.

Many claimed the brutal revenge was all the justice the smaller lad needed.

“That was beautiful,” one viewer wrote.

(Image: FACEBOOK)

Another said: “I’d say the dude deserved it.”

A third added: “Little dude lit his a** up real quick.”

Being cocky in a fight rarely works out well for aggressors, as one man who strolled into an MMA gym found out the hard way.