Bono and The Edge of rock superstars U2 delighted fans when they made a surprise appearance at a charity gig.
The Irish pair played an unannounced four-song set, before just 250 people, for Mencap's Little Noise Sessions at the Union Chapel, in north London.
Referring to their bandmates, Bono joked: "Don't tell Larry (Mullen) and Adam (Clayton) we've done this."
BBC Radio 1 DJ Jo Whiley, the event's curator, said the multi-million-selling duo "were actually nervous beforehand".
Whiley, who has helped curate a number of shows to raise funds for Mencap added: "Seeing them in a situation like this, in a tiny chapel, makes people realise just how great they are - worthy of all the praise they get."
The crowd were told about some "very special guests" by organisers, but had no idea who it would be until they walked out on stage.