Glastonbury Festival is always full of surprises, with secret sets and special guests popping up throughout the five-day event every year.
It's become common that headliners will bring out unannounced guests on the Pyramid Stage, and this year Coldplay really took the crowd by surprise.
The band, fronted by Chris Martin, took to the stage on Saturday, 29 June.Thousands flocked to the Pyramid Stage to catch a glimpse of Coldplay, who performed an incredible 21-song set.
Midway through their record-breaking set, Coldplay brought out their special guest - Back To The Future star Michael J. Fox.
Read more on ok.co.uk