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

Watch: The 1975 perform 'Oh Caroline' live with Caroline Polachek.

During The 1975's show in Cork tonight, Caroline Polachek joined the band onstage to perform 'Oh Caroline' as a duet with Matty Healy.

Watch some fan-filmed videos of the performance below...