Every Christmas Eve my husband makes seafood chowder which gets reheated in a double boiler Christmas morning for us to enjoy all day. This morning as it was reheating, we noticed it foaming over the top of the pot and spilling into the second pot. It wasn't just foam on the top, it was a giant pot of frothy foam. It was actively foaming and not stopping. Some thought it smelled a little off, but not horrible. We have no idea what happened but decided we could not eat it. He used shrimp, sea scallops, and swai from the local grocer fish counter, and canned crab and clam. Any idea what caused this crazy chemical reaction?