Sure, you've seen him take off his shirt in 17 different magazines, your DVD of "17 Again" is scratched from repeat viewings, and you sneak listens to the "High School Musical 2" soundtrack when you think no one's around. But how well do you really know Zac Efron?

With the embattled star's anticipated comedy "Neighbors" set to hit theaters, we decided to comb the available, er, literature about the Z man to see what he was really about.

And it turned out that, though Efron has a kind of universal charm and appeal, he’s not really like most stars out there today. So with that in mind we devised a few questions about his life and views.

Each of the questions has four possible responses. Three of them are things that Efron says, does or owns -- and the fourth is something that someone else famous has said, done or owned. Your Troy Bolton-level challenge: find the one thing that doesn't apply to Mr. Zac. The answers, like Mr. E's career, don’t always move in the expected direction.

Which one of the following statements did Efron not make?

(a) "You have to accept the moments of glory but also a great responsibility. And that responsibility, to some degree, involves being a role model."
(b) "I know that in my past I was young and irresponsible, but that's what growing up is. You learn from your mistakes."
(c) "I'm constantly searching for characters that are about betterment of self and betterment of others.
(d) "I sit here in front of you today much happier and healthier than I've probably ever been."

Which one of these books is not confirmed as having a spot on Efron's shelf?

(a) "Born to Run," by Christopher McDougall
(b) "The Tao Te Ching," by Laozi
(c) "The Seat of the Soul," by Gary Zukav
(d) "Siddhartha," by Herman Hesse

Which one of these activities is not part of Efron's health-and-fitness regimen?

(a) Swallowing raw eggs, "Rocky"-style
(b) Eating clay to rid his body of toxins and heavy metals
(c) Drinking pH-balanced water from a specially installed alkaline faucet
(d) Consuming up to 3,500 calories a day while bulking up

Which one of these weird injuries has Efron not suffered recently?

(a) A broken jaw from slipping on a wet spot in his kitchen
(b) Being struck in the face by a vagrant in downtown L.A.
(c) A fractured hand from grabbing Dave Franco's private parts
(d) Slicing open his hand while playing the drums with beer bottles

Which of the following things did Efron not say about going shirtless?

(a) "Those are the awkward scenes, where everybody is fully clothed and it's raining and I'm waiting there, the only person just posing there."
(b) "Eventually I realized that, like, the cameras weren't really even pointed in my direction .… And [a costar/producer] was just [messing] with me."
(c) "The second day of filming was Abercrombie and Fitch. I was standing there going, "This is my nightmare. This is very well what could happen to me someday.'"
(d) "This is the first time it makes sense, because we're making fun of it. I'm a douche. And that's cool. I love it."

Answers: b (that's Lindsay Lohan), c (that's Jay-Z), b (that's Shailene Woodley), d (that's Ed Sheeran) and a (that's Taylor Lautner).