While in SXSW in Austin, Texas to promote his new comedy film "Neighbors" with Seth Rogen, Zac Efron sat down with E! to discuss a possible reunion with his "High School Musical" cast mates. He said he was "100 percent" on doing the project and that he and the other actors involved in the three HSM films were "all thinking about".

And since, Rogen was there, he suggested that an R-rated version of the Disney film would be interesting to watch.

But, like seeing old high school classmates, Efron said he and his former cast mates share a special bond because of the years they worked together. He said, "I continue to see all the guys from 'High School'. Every time we do...there's just this look between us. It's so cool because we never forget a single moment of that experience...It just brings you right back to those days."

"High School Musical" first premiered in 2006 on the Disney Channel as a film-made-for-TV, CBS News reported. It was the network's most successful TV-movie project of all time; and in the same year, the film's soundtrack became the highest-selling album.

On the following year, a sequel was released following the same TV-movie format. In 2008, a theatrical film, the "High School Musical 3: Senior Year" was released and grossed $50 million in North America and $40 million overseas during its third opening day.

After the "High School Musical" trilogy, Efron had a flourishing career and starred in films like "17 Again", "Charlie St. Cloud", "The Lucky One", "Parkland" and "That Awkward Moment".

In his latest film, "Neighbors", he plays a fraternity president who is the source of his next-door neighbor's problems. In an article on E! Online, he shared his experiences in filming the raunchy scenes for the comedy film. "It was neat," he said, "For me it was essentially the same as filming a drama. They took it really seriously."

He added, "For us, we really had a fraternity. We really made it into a fraternity. It was kind of a method. It really was. It was just so much fun."