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

Watch Billie Eilish perform as Sally in a live rendition of 'The Nightmare Before Christmas' songs.

Fully in costume, Billie Eilish performed as Sally at a live rendition of the songs from Tim Burton's 'The Nightmare Before Christmas' this past weekend.

Watch some clips from her performance below...