Efron is busy promoting his upcoming comedy, Neighbors 2
, hitting theaters on May 20, and admits that he wasn't sure how co-star Seth Rogen felt about him when they first met. "I was at a party. I was maybe 20. At the time, even a teenager’s opinion of me was pretty low. I wouldn’t say I was a fan of my work, you know?" he quips. "I went up and shook Seth’s hand. I was like, 'You probably don’t know who I am. Or you hate me.' And he’s like, 'Oh man. You’re gonna end up being a nice guy, aren’t you?' He expected me to be the cockiest a**hole in the world."