J' te 'L'Dis Quand Meme

Patrick Bruel is a French singer. In 1989, he released the song "J' te 'L'Dis Quand Meme." At a concert some months later, he found out how popular the song really was when the audience sang it completely through at a concert. You can see the astonishment on his face, and before it’s over, he is totally verklempt. (via Metafilter, where you’ll find the English lyrics)