Whether you wanted to be or not, you are now forever indebted to Zac Efron [1]'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 [2] performing in his real-life high school musical [3]. 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 [4].