Ed Sheeran has been grinding out his headlining Mathematics Tour since April 2022, but he’s still finding ways to keep it fresh. On Saturday, August 24, Sheeran hit Arena Națională in Bucharest, Romania, and he brought a friend.

“Basically, what’s happened is Chris (Hemsworth) emailed me last December saying he’s doing a documentary on cognitive health and the benefits of learning [an] instrument,” the four-time Grammy winner explained. “He came to visit me, and he has learned drums. He’s coming on stage in front of 70,000 [people].”

Hemsworth chimed in, “I’ve been thinking about it a lot. It’ll be nice to put this one to bed.”

Ed only informed the crowd after it was done that they had unknowingly been treated to the drumming of Hemsworth “for the whole time” before performing “Thinking Out Loud.” Afterward, Sheeran complimented Hemsworth’s outing and presented him with a silver trophy — “a participation award” for “drumming excellence.” In his own Instagram post, Chris joked in his caption that joining Ed on stage was “maybe the most nerve racking stunt he’s done yet for Limitless.”

In November 2022, Hemsworth opened up to Vanity Fair about discovering he possessed to copies of the APOE4 gene, which is linked to increased risk of Alzheimer’s, while Hemsworth was working on Limitless for National Geographic. Unfortunately, the aggregation machine grabbed hold and perpetuated misinformation that the 41-year-old Australian actor had been diagnosed with dementia, which Hemsworth addressed with Vanity Fair earlier this year.

Chris learned how to play drums for the performance as part of a challenge from his Disney+ and National Geographic show, Limitless with Chris Hemsworth. The series follows the Marvel Cinematic Universe actor as he attempts various tasks to challenge himself mentally and physically.

The official synopsis of Limitless reads, “Chris Hemsworth is on an epic mission to discover how to live better for longer. With the help of world-class experts, family, and friends, he’s embarking on a series of immense challenges to push himself to new limits and stop the diseases of old age before they take hold. In this thrilling series from executive producer Darren Aronofsky, Chris discovers how we all can unlock our potential to stay fitter, healthier, and happier throughout our lives.”