Ok so this one wasn't exactly in a fridge -
As I cleaned my room for the first time in 7 (?) weeks, I noticed an odd container buried beneath the detritus of academia:

I approached with fear and caution. Slowly, with steps no larger than a cubit each, I moved to unleash the contents of the relic. (Even my Ancient Earth: circa 2100 - 3000 professor would've been hesitant to investigate.)
Gingerly, I dislodged it from its resting place, as if from a sepulcher. Like disturbing the corpse of an ancestor, this felt wrong. Very wrong.
As I laid this thing upon my bed, a shiver went up my spine. A fluttering sound came from elsewhere in the room - I jumped at it. But as it turns out it was just those damn bugs that infest my windowsill! There are like 50 of em!!
It took a small leap of courage and all the willpower I could muster to pry back that chartreuse latch. Heart pounding, I slowly lifted the lid -
and was overwhelmed by torrents of deadly fumes.
It was a trap, it must've been. Perhaps laid by the bounty hunter Jarlath, or some imperial kill drones. I knew I had to act fast.
With the N2O4 levels rising alarmingly, I reached for my trusty volatile substance neutralizer / documentation device. In a flash of heat, the deadly gas was dissolved into its constituent elements. What was left was shocking, to say the least.

See for yourself! Only a seemingly ancient crust of solidified cheese sauce remained after the toxins were released. And the mold? Well, probably just the remnants of the hyperactive aging chemical used to start the deadly reaction.
From this piece of evidence, I could tell I was dealing with no Jarlath. No, this was no 2-bit bounty hunter out for his credits.
I was dealing with a real professional.
And that's 'm tale! Another round of space grog for all!