I would boil them up. Big pot with spices and assorted other stuff. Get a pouch of Crab Boil or make you own.

The lobsters should be alive and the crabs as well. I usually steam lobsters in my huge stock pot. You can put a wooden or metal rack in the bottom of the pot...or even stack forks and spoons...pour in water, to about 3" and boil until steam is created, and then steam for 20 minutes. I have heard of crab boils where you just add your seasonings to the boiling water.

corn on the cob and boiled potatoes with parsley

Make them into pets. lol