It's just Kathryn Hahn (from TV show Happyish) providing the serious 'happy clappy' in a Russell Crowe and Eddie Izzard sandwich. 

While Eddie is just learning all the languages of the world (via his brother; he learns them first) so he can perform stand up in the applicable country, Russell has quite the nugget of stand up gold to make Izzards gigs even funnier. It's just as insightful as you'd imagine.

Naturally, things progressed to the evolution to Russell Crowe's nickname. As Irish people, we relate...