The Soap Opera Effect is when the TV changes the media....killing off characters, making some pregnant, making some have Amnesia and making pretty much everyone devious!
OK, really, it's when a film-based media has the look of being shot in video instead. I've seen it a few times since buying an LCD TV, but have since changed the "Tru-Motion" settings to OFF. It has to do with frame rate on LCD TVs that are able to use 120MHz, 240MHz, etc. motion settings.
Some day, I'm going to learn to use all the features on my 1 year-old TV!