"Blame It on the Alcohol" is the fourteenth episode of the second season of the television series Glee, and the thirty-sixth overall. The episode was written by Ian Brennan, directed by Eric Stoltz and first aired in the United States on Fox on February 22, 2011. This episode mainly centers on the issues of underage drinking, as the students of McKinley High School are coming drunk to school in increasing numbers. Principal Figgins plans an assembly to warn the students about the dangers of underage drinking, and asks glee club director Will Schuester to have his students perform a song that sends positive messages about avoiding alcohol. Rachel Berry throws a party for the glee club students where almost everyone gets drunk; the partygoers wake up to hangovers, and must perform various songs about alcohol while still under the influence. The assembly ends abruptly when a song that seems to glorify alcohol is interrupted by two of the singers vomiting over the others, which scares the entire high school into avoiding drunkenness.

The second season of the musical comedy-drama television series Glee originally aired between September 21, 2010, and May 24, 2011, on Fox in the United States. The 22-episode season was produced by 20th Century Fox Television and Ryan Murphy Television, with executive producers Dante Di Loreto and series co-creators Ryan Murphy and Brad Falchuk, with the other series co-creator, Ian Brennan, as co-executive producer.