Tarzan and Ka-Zar

Talk about a couple of overachievers!  As if living in the jungle and fending off attacks from lions, tigers and crocodiles in only a loincloth didn't make them tough enough, they both regularly seemed to be going toe to toe with dinosaurs as well!  It's a good thing they have their trusty knives on them at all times (how do you think that they always keep their faces so clean shaven?)