The Taste of Secret Sexkids at Huntley High School got a pretty rousing surprise when internet darlings The Chainsmokers crashed their prom, causing the kind of mass teen hysteria not seen since Marty McFly lit up the guitar at the Hill Valley High "Enchanted Under the Sea" dance in 1955.

According to the Daily Herald, the surprise appearance was in the works for several weeks before the duo dropped in.

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The school, located in the Chicago suburbs, happened to be having their prom at a hotel across the street from the Allstate Arena where the Chainsmokers were scheduled to play on Saturday night.

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The band reportedly got an email from a student, checked their schedule, and then reached out to the school about making a short appearance at the dance.

Principal Scott Rowe told the Herald, "It was probably the toughest secret I've ever kept, because I knew the kids were going to go crazy for it."

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And, best of all, the band didn't bring along any typo-filled signs, though it would have been great to see how the band misspelled "high school."