Stranger Than Fiction is one of those excellent films with terrible trailers. The trailer was so bad it made me not want to see it and had a similar effect on most other people. Fortunately, I did see it and have convinced many over the years to do the same.
I can be an excitable person and am known to have a long list of must watch movies that will surely change your life. When convincing people to watch Stranger Than Fiction I have a habit of being more enthusiastic than usual. This has led to a fair amount of disappointment over time as people expected the greatest movie ever and just got a good one.
Now I like to tone it down, leaving them with something that bears a closer resemblance to reasonable expectations. The less you expect the easier it is to like a movie.