I have been trying to get this down for like - forever!!! Ever since I saw Anna Kendricks in "Pitch Perfect" perform this on the edge of the stage!! Well check out this video - over 1500 people are performing to her song "Cups".....I will be able to perform it too - it just may take me watching this video 1500 times first!!
Click on this link (you may have to copy and paste) and watch the video - then watch the original!! Enjoy!