Mine's octopus, it was a dare. lol

Tortilla "bread" bought in a store.

Tastes like rubber.

Fois gras, I just can't stand the taste of it...

Banana

Almost anything incorporating mint. For me, mint will pretty much always be associated with toothpaste and mouthwash and it just doesn't work for me as far as actual eating enjoyment goes.

When I was in college, my roommate decided that she'd make arroz con pollo (Mexican rice with Chicken). She wasn't paying attention and used cinnamon instead of comino (the spices look very similar). The resulting taste is something I'd rather not experience again.

Let's just say she failed to practice "basic feminine hygiene".

I dont think carpet munching is considered a "food" and im pretty sure that wasnt ketchup.

For me its Marmite and Vegimite

When I was a kid I used to really enjoy weetbix covered in hot water. one morning my mother decided she'd clean the jug with vinegar... she then learnt just how similar weetbix and spew looked like.

Undercooked cauliflower brains . Never again. I'm sure there are worse properly cooked meals out there, though.

http://www.weetbix.com.au/products#weet-bix-original

All time? I think perheps tripe.
Recently, a pasta salad from the supermarket where the pasta was dry and grainy.

Sorry I asked. :P

This was in army, long a go. The dish was some sort of banana/chicken thing.