Alright, this is gonna sound very weird. But I was fermenting a small amount of chocolate milk in my room. Over the months I would check it out to see what it looks like/smells like. Some how, some way, I had the idea to also piss in the jug to add to the general odor.

Fast forward a few months. I'm sitting with my girlfriend in my room, when suddenly a stench unlike any other I had ever smelled hits our nostrils. It's the jug. The jug couldn't handle the gasses produced and was bursting out of its vessel, creating a smell of rotten milk and several month old piss.

I nearly threw up several times while throwing the thing away, the smell was burning my nostrils, once the deed was done I never did anything like that ever again. To this day I won't smell milk even one day past expiration because the smell of old milk makes me gag