Need a sound clip

Im tying to record the ‘mmmmm danone’ bit at the end of this ad, but dont know how to do it other than recording a mic against my speakers – where it sounds shit… anyone able to do it? Or tell me how – I cant get fraps to do it…

http://www.youtube.com/watch?v=tVnwpSUgkUg” onclick=”window.open(this.href);return false;