Spoiled Milk. Seriously, 3 years ago in January 2021. I smelled milk on Tuesday, January 19th, 2021 that expired on Monday, January 11th, 2021. It was some kind of cheap milk brand, but my God. It smelled awful. It pretty much made me stop drinking milk all together. I can't even 100% confirm that milk wasn't growing some kind of black mold.
It was around 4 in the morning and it was tragic and iconic at the same time.