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

Dustin Hoffman kissing One Direction's Niall Horan.

When One Direction appeared on 'The Late Show with David Letterman' last week, Dustin Hoffman took advantage of the opportunity to make out with Niall Horan.

Ermmm... watch what happened below...