Zac Efron and Vanessa HudgensIt's one of the oldest and dirtiest tricks in the male playbook. They're unhappy in a relationship but they're too wussy to call it quits. So what do they do? They act like jerks until the girl dumps them. In their feeble little man minds they firmly believe this makes them walk away as the good guy. Our jerk radar has started buzzing recently over Zac Efron's quietly jerky comments and actions, causing us to wonder whether he is trying to lead his girlfriend Vanessa Hudgens' down the primrose path to dumpsville.

"Guys try to get girls to dump them when they fall out of love and feel guilty. When you are a nice guy, telling a chick to beat it just isn't that easy!" says Jay Grdina, CEO of the celebrity website Kikster.

Efron gave a passively subversive interview to Details magazine this month where he commented on the fact that he isn't a playboy, saying that he isn't into playing the field...but he should be.

"I think a lot of guys would enjoy that. But I'm not really like that. Believe me, I rack my brain thinking 'Why am I not out there playing the field?' One of my buddies was like, 'You have no idea what's going on right now. You're peaking on Ecstasy and you're watching TV.' But it's not in my heart."