I come from Canada, and while it appears they have Weetabix there now, there is also a similar cereal called Muffets. It's the same thing, they're just round in shape. You eat them with milk and sugar, or soak them in boiling water, drain it off and then add milk and sugar.
I don't think I eat any odd food combinations, but I've known some people who did.
My mother's friend ate peanut butter and Spanish onion sandwiches. I like both of those separately, but I don't think I'd eat them together at gunpoint!
My grandfather used to slice a cantaloupe in half, hollow out the middle, and put in a scoop of vanilla ice cream. That might be good, if you like cantaloupe, but I could never get past its smell.
Before we were married, my wife couldn't cook to save her life (it runs in her family). She used to eat a bowl of julienned raw carrots, with hot vegetable oil poured over them, and vinegar. Since we've been married, I've taught her to cook, and she hasn't eaten any of that in over 11 years.