Ok, so I just watched the first episode of Dragon Ball for I think the first time, and upon meeting Goku, Bulma hits him with her car, then shoots him several times with a gun, and then expresses surprise that this has failed to kill him (note: he is obviously a child and she clearly believes this).

I guess there are talking dinosaurs and other prehistoric beasts around trying to eat people, so maybe this is just a post apocalyptic, kill-or-be-killed hellscape?