Ashley Madison (2015)
All data breaches are scary, but some just have that extra scream factor.
In arguably the most embarrassing data breach of the bunch, a group calling itself "The Impact Team" stole 37 million records from adultery website Ashley Madison, including many records that customers had paid to have deleted.
Virtually all of the company’s data was stolen in the hack, including records that suggest most female accounts on the site are fake, and that the company used female chat bots to trick men into spending money.
Image: Chris Wattie/Reuters/Corbis