Michael J Fox joined Coldplay on stage in the US for a little Back To The Future tribute.
The band were performing a gig in New Jersey and showed a video of a fan asking them to play a tune from the "greatest movie of all time".
To everybody's surprise, Michael then walked out on stage.
They then launched into two tracks that Michael performed in the the iconic 1985 movie - Earth Angel and Johnny B Goode.
To the delight of the crowd, the TV and film star joined in on the guitar.
Coldplay frontman Chris called the moment a "dream come true".
Michael has played with the British band before. They performed together at a New York City benefit show for the Michael J Fox Foundation for Parkinson's Research in 2013.