[Thor]

Rotten shark beats all this hands down.

http://en.wikipedia.org/wiki/H%C3%A1karl

Hákarl is traditionally prepared by gutting and beheading a Greenland or basking shark and placing it in a shallow hole dug in gravelly-sand, with the now-cleaned cavity resting on a slight hill. The shark is then covered with sand and gravel, and stones are then placed on top of the sand in order to press the shark. The fluids from the shark are in this way pressed out of the body. The shark ferments in this fashion for 6–12 weeks depending on the season.
Following this curing period, the shark is then cut into strips and hung to dry for several months. During this drying period a brown crust will develop, which is removed prior to cutting the shark into small pieces and serving. The modern method is just to press the shark's meat in a large drained plastic container.


Chef Anthony Bourdain, who has travelled extensively throughout the world sampling local cuisine for his Travel Channel show No Reservations, has described shark þorramatur as "the single worst, most disgusting and terrible tasting thing" he has ever eaten.
Chef Gordon Ramsay challenged journalist James May to sample three "delicacies" (Laotian snake whiskey, bull penis, and hákarl) on The F Word; Ramsay then vomited after eating hákarl, although May kept his down. May's only reaction was, "You disappoint me, Ramsay."[1]
On season 2's Iceland episode of Travel Channel's Bizarre Foods with Andrew Zimmern, Andrew Zimmern described the smell as reminding him of "some of the most horrific things I've ever breathed in my life," but said the taste was not nearly as bad as the smell. Nonetheless, he did note that hákarl was "hardcore food" and "not for beginners."