Whether you wanted to be or not, you are now forever indebted to Zac Efron's high school drama teacher, Robyn Metchik. In an act that could potentially make her worthy of sainthood, she provided Jimmy Kimmel with an amazing video of the Dirty Grandpa star performing in his real-life high school musical. The hilarious clip, which was shared on the late-night show on Thursday, shows a young Zac belting out "You're a Good Man, Charlie Brown" while singing and moonwalking across the stage in a Snoopy costume. Naturally, Zac had to prove he's still got it and gave Jimmy's audience a special performance. Watch Zac's vintage moves above, and if you want to put your heart in further danger of exploding, check out his latest shirtless Instagram picture.