TISM (an acronym of This Is Serious Mum) is a seven piece anonymous alternative rock band from Melbourne, Australia. The group formed in 1982 and enjoyed a large underground/independent following until 1995 when its third album Machiavelli and the Four Seasons reached the Australian national top 10. TISM is known for its hybrid of dance music and rock'n'roll, high-energy live shows and humorous lyrics.