An unknown group of people has hit the streets, spray painting walls and surfaces with taglines from the comic strip and soon-to-be movie Watchman (opening tonight in theaters). It is unknown whether these rogue marketers were hired by the movie studio or are just big fans of the graphic novel, but one thing is clear - it is an effective strategy for promoting the movie.Immersive marketing is marketing that doesn't simply shove a product in front of us with advertising, but rather invites us to be part of a story that becomes something we talk about and spread to others. By creating an experience that is unique and stimulating, this type of approach reaches to people in an unobtrusive way and invites them to interact naturally (LOST has done this very well). People want to share experiences and stories (and pictures of Watchman graffiti on social networks), so developing strategies around immersive marketing is a smart way to go.