coup de main - noun
kü-də-ˈmaⁿ
Definition of coup de main : an attack that achieves complete surprise.

Paul McCartney + The Killers perform 'Helter Skelter' together live.

Much to the delight of guests at Russian billionaire Roman Abramovich's New Year's Eve party last week, Paul McCartney made a surprise appearance, joining The Killers on-stage to perform The Beatles' song 'Helter Skelter' together live.

Watch clips of the performance below...