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

Watch: Haim perform 'I Know Alone' on The Late Show with Stephen Colbert.

| by rose_riddell

Having just dropped their new song 'I Know Alone' yesterday, Haim all appeared on The Late Show with Stephen Colbert (from their respective houses) to perform a live rendition of the song.

The ending even included a co-ordinated light show - watch the performance below: