Justin Timberlake learnt cartoon voices as a child because he didn't have any siblings.
The singer-and-actor - who voices the role of Boo Boo in the forthcoming animated movie 'Yogi Bear', based on the cartoon of the same name - found getting into character easy because he would entertain his parents by pretending to be the drawn TV stars.
He said: "Funny enough, I learned how to sing when I was a kid [by] imitating singers on the railroad like Al Green and Don Henley. I was an only child and was obviously really bored, so I would entertain my parents by imitating cartoon voices like Scooby Doo, Boo Boo and others.
"So, you know that about me now, I guess. I'm killing any cache of cool I've managed to build up over the years. I would have recordings on set and would listen to them to get the tone and inflection. Then, once I did all my lines for the day, I'd usually do them all again because I got into the zone, if that makes sense."
Justin voiced the character alongside Dan Aykroyd - who stars at Yogi - and unusually for an animated film the pair shot scenes together, something which he believed helps bring them to life.
He told AskMen.com: "An interesting thing about the process of voicing these characters was the director had Aykroyd and I come in and record together in several sessions. That was a brilliant idea because Yogi and Boo Boo really are a team. They're Batman and Robin. It made a difference with The Rhythm of the banter between the bears."