@temptoetiam : artichoke. First of all the taste itself is disgusting. But also who the f*ck came up with the idea to peel all the leaves, pluck the thorns, and then finally eat this tiiiiny little heart that's way too sweet and still leaves you hungry ? What the masochistic hell...?
I also agree with the comments that mention a number of fruits (I have issues eating all raw fruits in general, I need them transformed somehow) and beets. However I do not condone the celery hatred.