Zac Efron annoys his 'High School Musical' co-stars by filming them all the time.The 20-year-old actor - who stars as basketball stud Troy Bolton in the Disney movie franchise - can't stop using his 'Zac cam' according to Corbin Bleu, who plays Chad Danforth in the teen films.Corbin said: Zac walks around everywhere with his 'Zac cam' and films everything. He put tape around my trailer like it was a hazard. I was like, 'What the heck is going on?!' And he was filming it all on his Zac cam! Vanessa Hudgens, who is Zac's co-star and real-life girlfriend, added to Top of the Pops magazine: It's...

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