Heat a large pot of water over medium-high heat indoors or outside. Add the seafood seasoning to taste and bring to a boil. Add the potatoes and sausage and cook until the potatoes are fork-tender, about 10 minutes. Add the corn and cook until cooked, about 5 more minutes. Add the crab and cook another 5 minutes. Add the shrimp and cook until they turn pink, another 3 or 4 minutes.