Every culture has some traditional dishes that make those from elsewhere cringe. The author of this post heard from quite a few people in India that pizza is clearly disgusting! Here are some other offbeat delicacies from around the world. I think I would have to try some of these before I make a judgement. For example, in Iceland, you may encounter Hákarl, or rotten shark.
Typically, a Greenland or basking shark is the Hákarl shark of choice. First, gut and behead it. Next, place it in a shallow hole, dug in gravelly-sand, then cover it with the sand and gravel. Place stones on top of the sand in order to press the shark and extract any fluids out of the body. Allow the shark to ferment for 6-12 weeks. Following the curing period, cut the shark into strips and hang them to dry for several months. During this drying period a brown crust will develop. Remove the crust prior to cutting the shark into small pieces and presto, ready to serve.
http://www.highestfive.com/food/worlds-strangest-delicacies/
From the Upcoming ueue, submitted by mrmunchies.
Also certain things that people find gross are things that were on every dinner plate 100 years ago. The ONLY reasons we don't eat them today is that they are hard to prepare or hard to ship and preserve.
Read a good cookbook from before 1920 and you will find a lot of things that people just throw away now.