The victim appeared to be in complete shock by the attack and was knocked backwards by the impact.
As the man attempts to walk away, he is then pounced upon by a second older man who punches him in the ear while another laughs hysterically at the beating.
A mentally challenged man was sucker punched in the face as he walked down a street in the Germantown area of Philadelphia.
In a 30-second video which was recorded in slow-motion, a man is seen smiling before being distracted by a teenage boy who punches him hard in the face for now apparent reason and without warning.
Having to get space from one of my partners because their physical closeness makes me feel like I am about to jump out of my skin is difficult.