‘Zac Efron admits he used to annoy his parents when he was growing up — because he was “constantly” singing!  The High School Musical star admits his mom and dad got a little bit annoyed that their son kept breaking out into song. “I was constantly singing,” Efron told Nylon Guys magazine. “I would hear things on the radio and just be about to spit them out instantly, with perfect memorization and tone. My parents were like, ‘Shut up. Please stop singing. It’s annoying.’ ”

Zac — who is currently dating his HSM costar Vanessa Hudgens — says he doesn’t discuss his success as a Disney actor with any of his friends. “I try not to look at all of it,” he said. “You can’t enjoy or celebrate it — it’s not a real thing. The face on the lunchbox and sh*t — you can’t share that with your friends.” Efron also revealed that he never watches his own movies –but he did make the effort to see his new film Me and Orson Wells. “It’s the first time I’ve ever watched a movie I’m in and at the end I’m like, ‘OK! I didn’t check my watch once!’” he said.