The 'Dirty Grandpa' star sat down with Jimmy Kimmel Thursday, where he moonwalked around stage and took a trip down memory lane.
Zac Efron took a trip down memory lane with Jimmy Kimmel on Thursday with a super cute home video.
While fans have been freaking out over the 10th anniversary of High School Musical, Kimmel took things way back with this vintage video of Efron's performance as Snoopy in a school production of You're a Good Man, Charlie Brown.
Like all home videos from a person's teenage years, it was all kinds of hilarious and embarrassing.
WATCH: Zac Efron and Vanessa Hudgens' Original 'High School Musical' Auditions Are Beyond Adorable
From the homemade Snoopy costume to the Spartan set design, it was an endearing, humbling throwback!
Years later, the 28-year-old star hasn't lost his stage presence in the least, which he proved by showing off his sweet moonwalking skills.
WATCH: Zac Efron Shows Off Insane Biceps (and Abs) in New Candid Pic: 'I Woke Up Like This'
But that's not the only thing Efron showed off Thursday night. Before the episode kicked off, the Dirty Grandpa star shared a shirtless pic on Twitter, flaunting his massive biceps and ripped abs.
Check out the video below for more on Efron's topless green room snapshot.