Any of you who've seen the movie Pitch Perfect knows this song. It was originally performed by Lulu and the Lampshades, and then in the movie Anna Kendrick. After we saw the movie, y friends and I decided to learn the rhythm, which is done with cups. I learned it first and then only one other friend learned it. I can now song and do the rhythm on my own, but doing it with my friend ad the harmonies is so hard!
I used this video to learn the cup part.