6. Cass (literally) Loses His Head (Vol. 5.)
Volume 5 is definitely the one volume that focuses largely on everyone's favourite Irish Vampire. Although this particular moment is far from being one of the most essential in the series it is part of one of the more memorable sub plots including voodoo and a cult of Vampire worshippers, and makes for a generally funny moment that could bring a few laughs if translated to the small screen.