Watch James Corden And Harry Styles Break Into Song At The Worst Possible Moments

A funeral is not the best time for "Mambo No. 5."

Harry Styles is appearing on The Late Late Show all week long, and last night he and host James Corden proved once and for all what a dynamic duo they are in a sketch you can't help but smile at.

The concept is that Styles and Corden have a problem keeping their various jobs due to their tendency to break into song at inappropriate times. It all starts when they're performing a surgery, and they can't resist the urge to start singing Tom Jones' "It's Not Unusual." Unfortunately, it is unusual for two doctors to sing and dance while a patient lies on the operating table, and things don't end well.

Their future jobs don't go any better, although they're definitely entertaining to watch. If you can believe it, not everyone appreciates a pair of pallbearers singing "Mambo No. 5" during their loved one's funeral. 

At the conclusion of the sketch, Styles and Corden attempt to defuse a bomb. "The whole world is relying on us," Corden says. "So no singing, you understand?" You can probably predict how well that goes. (Spoiler alert: A George Michael tribute is involved.)

See every inopportune performance in the video below: