2009 when this british act did a version adding something new, a rhythmic cup accompaniment. actress anna kedrick caught wind of this and performed in last year s hit movie pitch perfect. people started doing their own version. what started with tween girls, moved to babies. watch this. reporter: grandparents. even entire families around the kitchen table. so we decided to try an experiment, we took six tweens and matched them up with a skeptical middle-aged news anchor. got to teach the oldster how to do this. i m lost. no. other way. i m working on basic mechanics. it s not mechanic. it s a cup. it took me a while. a long while. i finally got it. you re going to miss me when i m gone reporter: now i fear i will