Papa John's Chairman and CEO John Schnatter apologized to a customer in Sanford, Fla., for a racist rant a Papa John's delivery man inadvertently left on the customer's voicemail.

After he delivered a pizza to the Sanford customer and his wife Sunday evening, the delivery man "butt dialed" the customer and left a voicemail message laden with racial slurs as he complained about his tip.

The customer posted a video on YouTube in which he showed the pizza delivery receipt, explaining he and his wife tipped 21 percent, "as usual."

In the voicemail message, which lasts about four minutes, the Papa John's employee complains to another Papa John's employee about the $5 tip and uses the N-word and other racial expletives, which he also incorporated into a song about the customer.

"I guess that's the only requirement for being a nigger in Sanford," a city still reeling from racial tensions after the shooting of Trayvon Martin last year.

Read it at ABC News.