"At 8 I started to play the guitar," Justin said. "Basically when I started playing the guitar, I picked up a right-handed guitar. 'Cause that was all ... my mom had a right-handed guitar in the house. And picked it up and I picked it up left-handed. My mom would switch it the other way. And I would switch it right back to the other way and try to play. It was difficult because it's backwards. My mom, I think it was for my birthday, she bought me a left-handed guitar. And so ever since I was young I learned on a left-handed guitar."
8. Justin Bieber loves hockey.
"I love hockey," Justin said. "I played hockey all my life."
Justin said he played center forward and that he roots for the Toronto Maple Leafs.
"I'm a Leafs fan, yeah," he said.
9. Justin Bieber's favorite color is purple.
"What's your favorite color?" Connelly asked.
"Favorite color is purple," Justin said.
"You laughed there," Connelly said. "Do people ask you what your favorite color is sometimes?"
"Yeah, sometimes," the singer answered.
"Is it really funny to be asked what your favorite color is?" Connelly asked.
"Yeah," Justin said. "Like, who cares what my favorite color is?"
10. Justin Bieber's favorite food is spaghetti Bolognese.
"People ask you what your favorite food is?" Connelly asked.
"Yeah," Justin said.
"What do you say?"
"Spaghetti bolognese," Justin said.
Watch the interview on "Nightline" Friday at 11:35 p.m. ET