Cook 1 lb shell pasta, according to directions. While the pasta cooks add 2 tbsp of butter to a large skillet. Heat over medium heat until butter is melted. Add 1 c. diced celery and 1 diced onion to the skillet. Add 8 oz cooked lobster, 8 oz crab meat, and 8 oz cooked, peeled & deveined shrimp to the skillet and saute until heated through (or you can make this a cold dish and do not heat seafood) then remove skillet from heat and set aside. In a large mixing bowl, add 1 c mayo, 2 tsp lemon juice, 1 tsp Old Bay, 1/2 tsp salt, pepper to taste and 1 tsp dried parsley. Whisk to combine. Add the sautéed seafood and veggies stir to combine. Add the cooked pasta. Serve or chill in the refrigerator.