I had a similar experience to Kakar's once on the farm.
My old man bought a bunch of pigs from a guy who owned them because they were ALWAYS out of their pen and in my dad's fields. Buying them was easier than any other solution was his logic. We had a pen empty for them and everything. So he got em all caught up and brought to the hog barn out behind out house.
This is where I got introduced to the fun. The pigs were young enough we could still castrate the boars with no problem (about 70 pounds). That's no big deal to me since I'd participated many times. We also used a two man operation. I'd throw the pig, put a knee on the side of his neck and grab whichever hind leg was on top for the spread. The old man would kneel on the floormost hind leg and have both hands free for razor blade work. Thus we had defeated the need for a ******** popper.
Pigs don't suck their ********* in as quickly as sheep, apparently. He always got em first try.
So, on to the 'good part.' These pigs had been getting out of their pen daily since they were big enough to wander from their mother. And wandering the woods and fields in the area. Every single one of them had multiple large boils on him. Before we could even think about castration, we had to take care of all those huge festering infections.
So, we spent all afternoon on several different days where I'd tackle a pig and the old man would jab the pustules with his pocketknife , squeeze the pus and then give a penicillin shot. The smell wasn't what worked on me. It was the sight. Some of that stuff looked
just like creamy peanut butter. I made it through the episodes of pus-squeezing, but it isn't on my top ten happy weeks in my life.
As far as smells go, the WORST thing I've ever smelled was last summer. I 'caught' a jewfish that was around 100 lbs or so. I brought him up to the top and got a couple of pictures before the mate dislodged the hook so we could release him. While he was up, he puked up a few other half digested fish. Grouper do this quite commonly so I didn't expect the smell. This stuff was rank. I was glad to see that fish go.