As one of the biggest bands on the planet, you'd expect U2 to celebrate 40 years in the business in typical rock star fashion.
But the Dublin four-piece settled for cake and balloons as they celebrated 40 years in music on Sunday.
In a mock video that the band shared on Facebook, all four members can be seen sitting in silence at the get-together. The quietness is only broken by the sound of The Edge blowing a streamer and Bono popping a balloon.
The video has been watched over one million times as fans toast the band's milestone.
They formed on September 25, 1976 after a young Larry Mullen Jnr posted an advertisement for members to join his band on a noticeboard at Dublin's Mount Temple school.
It read: "Drummer seeks musicians to form band" and Adam Clayton, Paul Hewson (Bono) and Dave Evans (The Edge) all replied and in a career that's spanned four decades, U2 have gone on to become one of the biggest bands in the world.
And last month Bono confirmed that they'll embark on another world tour next year.
The lead singer told Spanish fan group 'U2 en Espana' that both a new album, and a new tour, are on the way.
"It's [the new record] not finished yet but you will like it. In terms of lyrics it is stronger than WAR, it has more clarity."
"The second part of the tour is for 2017... you might see a few things in September or October though."
Adam Clayton also confirmed that the new record and tour would be "soon... in the next six months."
The group made over €122m in ticket sales on their sell-out Innocence + Experience world tour.
It was the third best-earning tour in 2015.