Coldplay kicked off the North American leg of their A Head Full of Dreams tour on Saturday in East Rutherford, NJ, where they pulled a Taylor Swift and welcomed one very special guest to the stage: Michael J. Fox. Before the legendary actor made his debut, the band received a video message from frontman Chris Martin's son, Moses. "Hi Dad, it's your son, Moses Martin," he adorably began. "I was just wondering if you could play a song from one of our favorite movies, Back to the Future." Martin obliged by launching into an acoustic rendition of the song featured in the movie's school dance scene, "Earth Angel," before announcing Fox's arrival. They jammed out on guitar and even performed another song from the '80s classic, "Johnny B. Goode." If nostalgia hasn't totally overwhelmed you yet, check out the video above!