This method is downright malicious: do you have any idea how hard it is to execute a flash mob performance perfectly? To go through rehearsals, to find the perfect space and time, and to come up with a specific song that you want singing to get a certain message across? While a five part harmony of people dressed in banana costumes might originally seem like a lot of fun, the moment they start singing "Hayley, I can't dooooo this, please don't hate meeee but it's so totally oovveerrrrrr" is a moment you're going to remember until the end of time. Christ, anyone who organises a flash mob to vocally execute a break up is going straight to hell.