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

Watch: Catfish And The Bottlemen x Glastonbury 2016.

This past weekend at Glastonbury 2016, Catfish And The Bottlemen played a short secret set on the BBC Introducing Stage - during which they all sat on chairs like a boyband.

Watch '7' from their secret show below...