One such notable hack attempt targeting the 1948 Harvard–Yale football game involved the use of primer cord. One night shortly before the game MIT students snuck into the Harvard stadium and buried primer cord just under the field. The plan was to burn the letters MIT into the middle of the field during the game. However, their work was uncovered by groundskeepers and disabled. During the game the hackers were apprehended while wearing heavy coats on a fair-weather day. The coats were lined with batteries, obviously intended to be used to detonate the primer cord. An apocryphal story is that an MIT dean came to their defense, opening his own battery-lined coat and claiming that "all Tech men carry batteries"; an MIT dean did show up, but he was not wearing batteries. This phrase has since become common among MIT students.