Take the Opera Company of Philadelphia and their "Random Acts of Culture" campaign. They took 650 singers disguised as shoppers to Macy's in Philadelphia. With the Wanamaker Organ to accompany them, they "spontaneously" burst into the Hallelujah Chorus. But this blatant PR stunt can't possibly lead to ministry, can it? Watch the video below and you decide. Can you tell the "official" singers from the shoppers by the end? I'm assuming the Opera Company's motive was not to create a spiritual moment, but it happened anyway.
Ministry + PR = Great Commission.