@Print:
Burn it from a distance, it's the only way to be sure.
(Everything I have heard about surströmming makes it sound utterly horrific. I mean, you don't open cans in the house because the smell lingers for ages, so why would you actively eat something that does that? Isn't that, like, a massive sign that this is something that should not be eaten? I admit I'm vaguely curious as to what it's actually like, though - and given I love salmiak and marmite, I wonder if I might even like it… Also wondering if anyone has ever tried making a surströmming & durian meal as the most pungent dish ever made.)
Burn food?! Are you crazy??
Also, I don't know about marmite but it doesn't taste anything even remotely like salmiak. 
Hm. How to describe it… The flies are crazy about it, they will flock to it like some kind of zerg swarm. It does have slight smell of some kind, only many many times stronger.
It's an acquired taste, you're first instinct is indeed that "THIS SHOULD NOT BE EATEN". Hahaha. 
@wolfwoof:
Eat it? Can't imagine that it has gone bad
Of course I'm gonna eat it! It's just that I've been saving it for the "surströmming premiär"(the time you traditionally eat it). Hope it doesn't blow up until then…
--- Update From New Post Merge ---
I put it in a plastic bag(sopsäck) and put it in the fridge, that way it won't ferment much more and hopefully if it does burst it wont contaminate too much of my apartment.
--- Update From New Post Merge ---
Oh, and a crazy British dude opening a can inside: