Paramore performs during their 'After Laughter' tour on June 26, 2018 at Barclays Center in Brooklyn, New York.

Stranger things happened when Paramore played Barclays Center on Tuesday night.

The alt-rock outfit brought out Gaten Matarazzo, the child star who plays Dustin in the smash Netflix sci-fi series Stranger Things, and his sister Sabrina for a performance of 2007's “Misery Business.”

Matarazzo, whose own band Work in Progress is known to cover the song at shows, joined in on harmonies in Brooklyn. According to sources on the scene, his vocals were on point.

The collaboration was months in the making. Back in January, Paramore singer Hayley Williams spotted Matarazzo's rendition of "Miz Biz" and extended an open invitation for him to "crash the Paramore stage and thrash those luscious locks around." That finally happened. “Thank you so much for letting us jam out with you guys,” he later tweeted.

Williams also took to Twitter to gush over the musical magic created between the two.

the harmonies were so right. was NOT expecting that level of right-ness. ---- thanks for hangin with us & our friends. #tour5 https://t.co/88WGGb9bLR — hayley from Paramore (@yelyahwilliams) June 27, 2018

Paramore are on the road in support of their latest album After Laughter, which peaked at No. 6 on the Billboard 200. Next up: Express Live in Columbus this Thursday night (June 28).

Check out some fan-film clips and reaction below.

I can’t get over Gaten Matarazzo and his sister killing “Misery Business” with Paramore. -- pic.twitter.com/fysfIFQtv5 — Daisy Becerra (@dsbece) June 27, 2018

IM WATCHING GATEN FROM STRANGER THINGS GETTING READY TO SING MISERY BUSINESS WITH @PARAMORE I CANNOT BELIEVE THIS JS REAL LIFE pic.twitter.com/OfzcoJdbwB — no. (@thisisnotbrianm) June 27, 2018