I have a theory—is he always consuming alcohol when this happens? There are compounds found in some species of mushrooms and also in bad shellfish that are chemically similar to Antabuse. (Read mine and DaphneBlack’s responses in this thread.) I’m thinking that a miniscule amount of one of these compounds could be present in some type of fermented seafood-based sauce, or that possibly a product obtained from one of these mushroom species is actually in the food.