Sorry to rupture your dream guys, but lutefisk does not come in cans. The Swedish delicacy surströmming does, but I am afraid that opening those cans will result in a rather unmanly display of OMG, what is this??? sounds and gestures. Yes, those cans are supposed to be bulging as a result of the fermentation process.

For those interested in mans inhumanity towards fish (those are exact words from a British traveller's guide to Scandinavia), here's more about those aquired tastes:
http://en.wikipedia.org/wiki/Lutefisk
http://en.wikipedia.org/wiki/Surstr%C3%B6mming

About the P38: Most pocket knives and multi tools will have a can opener.