In a large stock pot, bring water, Old Bay, onion, garlic, and lemons to a boil.
Add in potatoes and boil for 15 minutes.
Add in corn and sausage. Boil for another 5 minutes.
Add in shrimp. Boil for another minute, then turn heat off and let everything sit for another 2-3 minutes, until shrimp is pink.
Drain everything, but make sure you save some of that broth!
Serve with extra lemons to squeeze on top and broth for dipping.