The opportunity to attend university for senior high school students has been dramatically raised from 30% to nearly 100% in Taiwan. This reform of education, however, has had almost no adverse effect on the popularity of cramming for examinations. Some argue that the reason is that cramming for examinations has become part of our culture. We set up a social norm model to explain why cramming for examinations can evolve into popular culture and why when the cram culture has become prevalent, it is very difficult to eliminate it.