Despite doing a load of sulfur chemistry in my time (e.g. thiophenol is the pure smell of dog shit) and having smelled putrescine (https://en.m.wikipedia.org/wiki/Putrescine), they’re not the worst. Too one note.
It was the Tupperware bowl of soup that my housemate made in the first week of us living together, forgot about in the back of the fridge, then opened two years later to get rid of before we moved out. Indescribable.