What's the worst thing you've ever smelled?

I worked a clean up crew for a large college campus. One day the boss offered a case of beer and a full day payed off to the person who would clean the bottom of the elevator shaft in the exchange student dorm. The whole summer they had been dumping their garbage down it instead of bagging it and bringing it to the dumpsters. Muck boots, painters suit, and full hood ppe did very little to the smell that followed me for days.

I was not worth a case of beer and a day off.

edit! that was second worst! I accidentally inhaled a full hit of silicon fumes from a friends bong he'd just repaired. that was terrifyingly awful. I thought I was going to fucking die on the spot.