What is the most repulsive thing you have ever had to deal with?

There’s a question about chewing tobacco, and most people found that dealing with spit cups was fairly repulsive, and I must admit that it definitely makes my stomach turn. But surely there are more repulsive things. I’m sure you all want to bury those memories deep down and far away, but it is not time to dredge them up and put them in the full view of the jellies.