PHOTO: Twitter/coldplaymidiasThe 63-year-old actor - who was diagnosed with Parkinson's disease in the early 90s - appeared on stage during the band's spectacular outro at Worthy Farm on Saturday night .
Chris said: "The main reason why we're in a band is because of watching Back to the Future, so thank you to our hero forever and one of the most amazing people on Earth, Mr Michael J. Fox. Thank you so much, Michael."He sang: "To Michael, we just want to thank you/ as humans go you're the best of all sorts/ you're a musical charmer, you're the world's greatest farmer, who ever got knighted wearing shorts.
"Thank you, all of you who have been waiting down here at the front for hours. It's amazing that none of you had to pee.
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