Jason Mraz does an improvisation while walking the streets of Paris. At the start he tries to say "C'est une belle journée." (trans. "It's a lovely day."), and he gets the pronunciation wrong (hee!). As he walks farther he meets a Bulgarian busker, and together they make music. This is truly awesome.
There are 4 more videos from this series - 2 can be viewed at blogotheque.net, and 2 more can be downloaded from http://val3rie.free.fr/bonusmraz/.