March 28, 2017 11:21 AM EDT

Bart Simpson has long been a favorite character of young Simpsons fans, but many of them may not know who the voice of the cartoon troublemaker actually belongs to. So when Nancy Cartwright — who has played Bart since the show began — decided to reveal herself to a lucky teen, it should come as no surprise that he pretty much lost his mind.

In a clip that recently went viral, Cartwright spends some time chatting with the 13-year-old — who is selling candy bars for a fundraiser — before doing an “impression” of Bart for him. When he finally realizes who he’s speaking to, his reaction is absolutely priceless.

Watch the video below.

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Write to Megan McCluskey at megan.mccluskey@time.com.

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