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

Watch: Ed Sheeran crashes a Katy Perry interview.

Adding further insult to singles-chart-injury, Ed Sheeran gatecrashed Katy Perry’s interview with Nick Grimshaw on BBC Radio 1 this morning, which resulted in fair bit of sarcastic banter.

Watch the interview below...