Human body in a decomposing state that was just pulled out of the ground after only being in for about 10-15 years, no guys, they aren't skeletons after 10-15 years. I was on a dig doing forensic archaeology and it's pretty bad, and the smell just kind of stays in your clothes...
Oh! Another HORRIBLE smell that I almost passed/puked out to:
One of our dogs was bitten by something, badger or snake, something with a REALLY dirty bacteria infected mouth, and he got a small sore. Well the sore got very large very quickly (abscess), and doggie was on antibiotics. A couple nights later, I get out of the shower, and I hear my dad/sister scrambling to get towels asking for more.
I wrap up in my robe and walk out to see what's going on.
Puss/bacteria/whatnot is literally squirting out of my dogs side, and he's just chillin', like "Thank you baby Jesus I feel so much better now!" with my sister (who's in the process of becoming a vet) and my dad, facilitating the exit of the foul substance by pushing it out. That smell, that bacteria smell, so bad. It nearly caused me to hurl on the spot (the sight probably didn't help either).
The dog fully recovered and once the abscess was completely drained, the antibiotics did their things and he was happy and healthy bouncing around a few days later.