A language with more strictly enforced interface inheritance would probably require a more, uh, deliberate intent to stick an electrical outlet into pig's snout

A language with more strictly enforced interface inheritance would probably require a more, uh, deliberate intent to stick an electrical outlet into pig's snout, but you could probably still go ahead and do this if you were really hellbent on it. I will concede that duck typing allows you to do this sort of thing more casually, though.