Hundreds of festivalgoers proved they had the moves like Jagger by taking part in a Jumping Jack Flashmob at Glastonbury.
It was held near the Pyramid Stage, where the band will perform their headline set on Saturday night, under the watchful eye of a giant metal phoenix that is perching on top of the structure this year.
A sound system played classic Stones songs including Brown Sugar and Start It Up to about 400 fans.
Organiser James Duke-Evans, 33, from south London, said: "It's gone fantastically well. When it got dreamed up late at night we thought it would be funny if 100 people turned up, but 3,500 joined the Facebook group in the end.
"People like to get involved in something that's not scripted and programmed. I've been told some people were looking forward to this more than the festival itself.
"And quite frankly - do you really want to live in a world where things like this don't happen?".
Sir Mick is expected to be on the festival site over the weekend, and is staying nearby with his family.
There is a chance he might even stumble upon the second "Jagger Off", at the silent disco held in the early hours of Saturday morning.
Many of those performing the moves, which including the "finger waggle" and "squeezing through a narrow doorway", wore Jagger masks as a tribute to their musical hero.