Sometimes I read "spoilers" in media websites where a movie script or tv show plotpoint is leaked out before it airs. There are plenty of warnings for spoilers for those who don't want the fresh experience ruined for themselves. While I don't seek out the spoilers I don't avoid them either. For example I pretty much know what happens in XMen 3 and I'm seriously debating whether to go watch it in the theatres because it sounds pretty crappy. But I don't know any juicy tidbits on the new Superman movie other than the general synopsis and I'll likely keep myself 'fresh' for that film which I'm looking forward to very much.
But every once in a while I like to go into a movie "blind". This is easier to do with DVD rentals, especially with older black and white movies. One such movie that I rented without any idea of what it was about (this was many years ago) was the 1962 original "The Manchurian Candidate". That experienced rocked. If you haven't seen or heard of the Denzel Washington remake then I highly recommend you rent the 1962 original with Angela Lansbury and Frank Sinatra and plopt it in. Don't read the boxcover or anything. It's a trip. And yes, Frank can act.