Officers called to the Parsippany, New Jersey RadioShack to investigate an incident Friday night found a man "holding a bloody paper towel to his left eye," reports NJ.com.
The man claimed that RadioShack employee Andre Santiago had punched him before running away.
Santiago told police he was angry that the customer "was being sarcastic," NJ.com reports.
Santiago was arrested and charged with assault, according to NJ.com.
The customer didn't seek further medical attention for his injury.