Aberrant consumer behaviour costs firms millions of pounds a year, and the Internet has provided young techno-literate consumers with a new medium to exploit businesses. This paper addresses Internet related ethics and describes the ways in which young consumers misdemean on the Internet and their attitudes towards these. Using a sample of 219 generation Y consumers, the study identified 24 aberrant behaviours which grouped into five factors; illegal, questionable activities, hacking related, human Internet trade and downloading. Those perceived as least wrong were; ''Downloading movie and music files from the Internet for free''. The consequences of these behaviours have implications for educators, consumer policy and marketers.