 The music video begins with short introductions to the characters Goldie , Yosef , Kriss , Ace , and Mandee . Perry is then shown entering all of the parties as " five of the world ’ s worst birthday entertainers " in disguise . At a man 's 90th birthday , Goldie emerges from a large birthday cake and begins to give the man a lap dance . At a child 's birthday party , Kriss the Clown attempts to create balloon animals , while Ace the Animal Trainer introduces a group of children to a box of mice before appearing to eat one , which makes a child cry . At another child 's party , Princess Mandee paints a girl 's face incompetently ; Goldie begins to suffer from respiratory problems , and Yosef does the worm at a boy 's Bar Mitzvah . Goldie pulls a man 's prosthetic leg off and proceeds to play air guitar with it , and Kriss crashes into a table before drinking alcohol behind a tree . 
