what kind of damage can a german cockroache do? yuck i've looked at that picture. hey you should check out a movie called the first creepshow by stephen king. where a guy work's in a office building and it's germ proof. he is a mean old bastard. a lot of people hate this guy and they wished that he would die. anyway his office building gets flooded with cockroaches and he tries to kill as many as he can. when that happens a blackout starts to happen and instead they end up killing him.. you might want to check that out and you should also watch another movie called "the nest" that is another cockroach movie.