Calling 911

Farming 101 - If you scream "Ah! Ah! Ah! Get it! Get it! Get it!" the dogs will come running as if you've dialed 911.

Okay... while this works well when rats drop out of the ceiling, I am sorry to report that this does NOT, I repeat, NOT work on Giant Prehistoric Cockroaches the size of dinosaurs. In fact, you can loudly scream, point, and dance, and I know at least three dogs that will take a long, hard look at the Gigantic Prehistoric Cockroach (I swear, it was a big as a Volkswagen!) and say to you, "Uhhhh.... it's a cockroach."
It also doesn't help to try to explain to First Responders that you have dialed 911 because you need HELP! My experience pretty much went like this:

See upside down cockroach on floor. Sweep it out of corner with socked foot while you bend over with paper towel to pick it up. In horror, realize cockroach is alive and is now right-side up and crawling across your foot. Scream and dance while shaking foot.

"Ah! Ah! Ah! Get it! Get it! Get it!"

Dogs come rushing over and look around for rat. You point at GIANT cockroach on floor. Dogs almost step on cockroach while looking for Evil Rat That Drops From The Ceiling. Point out cockroach again. Dogs stop the hunt and stare at you like the RCA puppy listening to the phonograph. Point out cockroach one more time. Dance back as cockroach moves toward you. Point and scream "THAT! THAT! THAT!"

Dog says, "Buuuuut.... It's just a cockroach, Mom."

Dance some more and insist dogs kill cockroach. Dogs almost step on Very Lucky Friggin' Cockroach many times as they try to comfort and reassure you that it's just a cockroach the size of a Volkswagen, it's not really worth all this screaming. Realize that dogs are worthless and you need to handle the job yourself. Decide that shooting cockroach with a 40 caliber handgun would do the job, but is probably not a good idea since cockroach is in the living room. Opt for a shoe instead. Order dogs to watch cockroach while you find shoe.

Opt against smashing cockroach with nice Antonio Melani boots and decide to use ratty tennis shoe instead. Realize dogs are helping you search for shoe instead of watching cockroach. Accuse them of leaving their post. Return to find cockroach is gone. Wonder how something the size of a Volkswagen can hide so easily in your living room. Put shoe down and start moving furniture. Lots of dust bunnies, no cockroach. Move more furniture.... find enough dog hair dust bunnies to make a small poodle, but still no cockroach. Look at three First Responders and realize they are wondering why you want to find Cockroach The Size Of Volkswagen. Begin to ask yourself the same question.