There is a Sound of Music sing-a-long and everybody dresses as his favorite character. Will ends up at the wrong address, but luckily meets a handsome guy. Grace, meanwhile, feels a little misplaced as a Maria without her Mr. Van Trap. Will decides to stay with the guy he just met, leaving Grace alone at the movie theater where starts singing songs from the movie to children. In the movie theater, Karen throws her flask of the balcony, she and Jack have to search for it before someone finds out that it was her who threw it, because her name is on it.