From his freshman year at Revere High School, Dahmer was seen as an outcast. By the age of 14, he had begun drinking beer and hard alcohol in daylight hours; frequently concealing his liquor inside the lining of the army fatigue jacket he wore to school. He is known to have referred to one classmate that his alcohol was " medicine". Although largely uncommunicative, in his freshman year, Dahmer was seen by staff as polite and highly intelligent but with average grades. He was a keen tennis player and played briefly in the high school band.