What is your least favorite combination of foods/food+drink? For lunch today, I made myself a fried egg sandwich. I then washed it down with a can of Coca-Cola. I know this doesn't sound that bad, but it's awful. The coke disturbs my stomach and makes me burp more frequently. Every time I do, I taste the flavor of already swallowed eggs and melted cheese. It is a very potent taste.

What else should not be eaten at the same time?