NBA Celtics coach preaches at press conference: 'Only one' royal family, 'Jesus, Mary and Joseph'

At a press conference this week, the Christian coach of the NBA's Boston Celtics took a moment to pointedly preach his faith in a way that appeared to leave assembled reporters too surprised for words.

Asked by a reporter if he had the chance to meet with "the royal family" when the U.K.'s Prince William and Duchess Kate attended a Celtics game at TD Garden this week, Coach Joe Mazzulla responded quizzically: "Jesus, Mary and Joseph?"

When told the question referred to "the prince and princess of Wales," Mazzulla said he had not met with them. 

"I'm only familiar with one royal family," he said. "I don't know too much about [the U.K.'s]." 

"Hopefully they're Celtics fans!" he added.