We can thank the show "Paranormal State" for this...
And, FWIW, I'm still waiting to be invited to document any exorcism. I've offered the services many a time. For some reason, the demons wont show when I'm there (Maybe I'm that bad ass), or they purport exorcisms wont work if I'm there recording it. :chin:
They're not as dramatic in real life. Usually a priest or priestess will absorb the entity and move it to a vessel or send it on its way.