Every so often there are movie crazes. They go from single movies to series of movies. Here are a few examples of Movie Crazes. (Avatar is not a Movie craze, it's too new, and it's a one-time only see.
Wizard of 'Oz - 1936-1970's We all we've seen this movie, but it had a definite Craze, and the line 'We're not in Kansas anymore' is still used today! And this movie was first made in 1939, with better quality productions still made today.
Titanic - 1997-2007 About three years ago this was still one of the most talked about and liked movies. This movie is still the highest grossing movie if you translate the dollar value to today. Almost everybody has seen this movie.
Lord of The Rings Trilogy - 2001-2003-2008 They worked on these movies at the same time, which is very unique so they can release one movie per year. This is still the geeks favorite movie, probably surpassing Star Wars.
Star Wars - 1999-2005-2003 These movies made even the most hard core geeks masturbate to it. These movies made the sci-fi era come to life again after Star Trek. And were the turning point of fantasy/Sci-fi, why else would Star Trek make so much money (Well, besides the old nerds).
Star Trek - 1966-1980-2009 Star Trek, even though I thought they all sucked, was one of the turning points of the TV/Movie Era. And We've all seen at least 15 minutes of Star Trek, and plenty of people saw Star Trek for the first time in 2009. Season one was arguably the worst season ever of Star Trek, but I hate all of the TV series.