And producer Brian Eno came up with the idea of hypnosis with the help of a Kenny "look into my eyes" Craig, Little Britain-style character.
Speaking at a Press conference in Madrid to launch new album Mylo Xyloto, Guy said: "We have been in a band long enough where we are comfortable to explore new ideas.
"Maybe one in every ten will come to something and the rest will be rubbish, but you've got to give things a try. We're confident enough to do that now.
"Brian suggested we try playing together when we were hypnotised. One of his friends came down and we tried it out. Nothing came of it but at least we tried it."
Thankfully the effects of the experiment on Will Champion, Chris Martin, Jonny Buckland and Guy had worn off yesterday. It would have been awkward with them parading around pretending to be chickens or robots.
The band were on top form before a huge gig to launch the album in the Spanish capital's historic bullring. Playing live they also unveiled a new interactive trick ? a wristband with an LED light worn by everyone in the crowd which lit up during the first song. It's the first time it has been done and beat the good old-fashioned lighter.
Watching a sea of fans waving their arms in the air was spectacular.
Earlier Jonny also paid tribute to The Stone Roses, who he thanked for inspiring him to pick up a guitar. He said: "It's fair to say that their first album was the reason I started playing a guitar. I can't wait to see the shows next year."
Chris added: "We actually invested in a film by our friend Mat Whitecross about four lads who tried to blag tickets for the famous Stone Roses Spike Island gig. Speaking as film investors, we hope the reunion is a huge success as it will be reflected in the box office figures."
Frontman Chris was on top form, laughing when a glass was smashed by mistake that it was his "fragile ego crushing under the weight of the reviews".
He also hammered any suggestion that the band would ever copy other people's music.
He said: "It's fine not to like our band, but making up s*** about us is not on. There's a difference between criticism and accusation. People who accuse us of stuff like that are *****, quite frankly."
He shouldn't worry. The reality is, the new album is on course to be the biggest seller of 2011. It's excellent.
But don't expect a Jay-Z collaboration in the charts any time soon. Chris added: "There's something kind of weird about men collaborating. I think I would find it hard to create sexual tension with Jay-Z."
He fancied Take That on Monday, then he was pictured hanging about with Ellen DeGeneres, now sexual tension with Jay-Z.
What next? Boxercise with Jake Shears from Scissor Sisters?