ok well a few times when i was in junior high these guys who thought they were the shit would crush several egg bombs into the carpets of the enclosed school hallways at one time. it would reek for days.
Melena which is black tarry stool caused by bleeding in the gut somewhere is pretty bad but my personal least favourite is fecal vomit which happens when you get a blockage in the bowel and everything gets backed up and comes out of the mouth.
We had fertilizer from a field near-by wash into a pond at work and kill off these giant catfish. The bodies would bloat and float at the top. When they popped, it was like the worst stink bomb in the universe – you could smell them a 1/4 mile away.
@Lightlyseared – hemorrhagic diarrhea is bad, but doesn’t have the sheer power of the catfish.