As a Scandinavian, allow me to disagree.
Surströmming and hakarl are fermented and stink to high heaven. When you open a tin of surströmming, you do it outside or under water. Norwegian rakfisk is its kid cousin. Lutefisk is a jelly-which-once-was-fish, has a mild odor - at least compared to the others - and tastes faintly of soap. So while it’s quite inedible, it’s the last of those I’d choose as a biological weapon.
I’m glad to see hakarl represented. I had an Icelandic cookbook that was an object of horrified fascination.
I was once about 10 feet away as a can of surstromming was being opened under water and outdoors. I wasn’t nearly far enough away, but at least I wasn’t one of the ones that hurled.
You would rate them:
Surströmming
Hakarl
Ludefisk
?
I’ve always thought they were pretty much the same thing. Same concept, anyway. Like different cooks making their own variation of something.
the question I always had in my head:
when the can of Surströmming expires, does the product get better or worse?
It ceases to be a “product” and becomes an “explosion”.
(More seriously, an authoritative site indicates that it becomes something akin to “a grey grease”. Ick.)
That’s the expiration date for the can, not the contents.
I heard that the Inuit used to age meat buried in the ground, but western types came along and said that was disgusting, it should be done in jars, which turned out for the worse as the jars retained toxins that the dirt would have leached away. I could have heard wrong, though.
It’s not leaching away toxins; it’s cutting off the supply of oxygen, which allows anaerobic bacteria like botulism to grow.
I don’t know how they were canning, but wasn’t meat that was buried also packed with a ton of salt?
Remember the I-85 bridge collapse in Atlanta in 2017 which was caused because the Georgia State Department of Transportation had a a state-owned storage area under the highway bridge, which contained high-density polyethylene and fiberglass tubing and this was set on fire by some homeless people?
You would think that this would cause either the federal Department of Transportation and/or state departments of transportation to make sure this kind of situation wouldn’t occur elsewhere in the country.
But not in Los Angeles where CALTRANS rented the space to a firm which put large storage yards of wooden pallets under this I-10 bridge.
It’s not clear yet to what extent repairs will be needed and how long they will take–but you would think that with that much heat there would be serious damage.
That’s what I meant.
I googled that and now I wish I hadn’t.
I’ll bet some dirty Sanchez made it up.
You think I’m going to google that now? 
Is there a word for a “google trap” like this? If not, I’m going to invent one, a google trap.
Apropos of nothing:
Wait…I thought that was called a “Glass Bottom Boat.”
Let’s not forget the beloved “Chicago Sunroof” either, or the “Hoboken Squat Cobbler”.
(For @TokyoBayer, I promise those are actually okay to Google, as bad as they sound.)