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

Watch: Ryan Gosling teaches Jimmy Kimmel how to waltz.

In support of his new film (with Emma Stone), 'La La Land', Ryan Gosling appeared on Jimmy Kimmel Live this week to present Jimmy with some presents and also teach how to waltz.

Watch clips from the interview below...