Profpointy
Legendary Member
I've not tried it but there are some hilarious 'Surstromming Challenge' videos on Youtube. Warning: Vom-alert!
I've eaten Hákarl (arguably) the Icelandic "equivalent". It is shark meat from the Greenland shark, which is left to ferment (rot?) for a couple of months, then dried. The original shark is poisonous without such treatment. The wikipedia entry says it "smells like cleaning products" (ammonia).
I took some to work after my holidays, but had few takers, and in the end complaints about smell from other parts of the office forced me to throw the rest away.
To be fair, although it doesn't smell great, it tastes OK, albeit I'd not want to eat a lot of it.