I've tried and eaten a lot of gross things (pickled pigs feet, pork hocks, head cheese, souse) but nothing tops "nook mom". I had some during my tour in Vietnam. It's a seasonly liquid you pour over meat, fish, rice, and veggies. Like soy sauce in consistency but that's where the like ends. It's made from decaying/rotting fish. The VIETNAMESE bury fish underground for a week(?) and the residual liquid from the fish is "nook mom". I tried it on a dare ONE TIME and barfed on the spot.
Nuoc Mam (cham) is one lousy tasting sauce but the Vietnamese eat like we do ketchup. One of my assignments during my tour in Vietnam was as an advisor/artillery FO for various allied units. With the Koreans it was Kimchi, a fermented cabbage dish. With MACV and the ARVNs it was the rotten fish that got delivered every three days and then cooked with hot peppers and smothered in nuoc mam. But the Australian special forces guys and their Montagnard tribal soldiers were the worst. They ate baby bats, dog, cat, rats, tree apes, rotten fish, and stuff I could not identify. They didn't seem to like snakes, maybe because they all seem to be poisonous over there. I survived it and only got amoebic dysentery.