Bad behavior isn't confined to the current era. The History Channel explores some of the behaviors of the celebrities of the ancient world, including Caligula, Attila the Hun, and Nero, using the latest archeological finds and forensic tests to examine their actions. Caligula, for example, had a widespread reputation as a sadist. Attila the Hun was known as a marauding barbarian. Experts look at their actions and try to shed some light on their motivations. And strictly for fun, they compare them to each other to see how each one rates against his ``peers.''