The Halloween massacre

The Halloween massacre is one of the most famous college myths of all time. It is not certain how and when it actually started, but it has made its way into most American universities. 

For decades now, it has created panic and fear among thousands of students (and possibly even a few professors as well). The legend goes that a popular psychic has made a prediction that on a Halloween night a masked man (in some variations, he is dressed as Little Bo Peep) will enter the campus of a university that starts with the letter 'M' or 'W' and is located near a pond/lake/river, railroad track, or cemetery. 
He will then kill everybody there. This story has existed for many years now, but no massacre has happened yet. However, students from all around the country still fear it, especially at colleges such as the University of Michigan, Michigan State University, the University of Minnesota and the University of Wisconsin.
Source: https://www.topuniversities.com/