Moment Arizona Wendy's worker sucker punches 67-year-old customer 

An Wendy's worker is facing assault charges after he sucker-punched a 67-year-old customer in the head after he complained about his order.

Surveillance video shows the moment Antoine Kendrick, 35, comes out from behind the register and punches the customer, knocking him unconscious. The elderly man then falls to the ground.

Kendrick looks at the victim as he lies on the ground before then walking behind the counter, grabbing a few items and walking away.

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