C is for Cerberus The three-headed dog that guarded the gates to Hades welcomed the freshly dead to enter, but any jerk that wanted to flee Hades and bop around ancient Greece once again would most likely be too horrified by Cerberus's howling or too horrified (and sickened) by the stench of its breath. I can vouch for dog breath - it can be pretty damn putrid. As with seemingly everything the Greeks could conceive, Heracles ended up besting it - most likely with the help of Cesar Millan.

Cerebus