Zac Efron visited Jimmy Kimmel Live Thursday, and the world will never be the same. That's because we now have footage of Efron doing the moonwalk as a young drama nerd, during a high school performance of You're a Good Man, Charlie Brown. That's right guys: real life High School Musical! After Kimmel played the clip of Efron doing his best Michael Jackson impersonation, the Dirty Grandpa star proved that he's still got it. Unfortunately, Efron's intense allergy towards shirts was contained for the evening.