First of all, the video of the Black Tie Beach 2012, an event organised by Improv Everywhere. This was their Third Annual celebration. In case you are wondering, the participants were asked to wear old and used clothes, so many of them got them at thrift shops. It was quite a big group of people of all ages and they spent the afternoon laying out, playing games, swimming...Here´s an anecdote of the event: at the end of the video they interview a man who says he is happy and he likes the idea because they make everybody happy; this is how the organizer of the prank explains their meeting:
Click here to do some activities with the lyrics - excellent listening practice.