All the following have a peculiar taste:
Tomato Ketchup (slightly tangy with hint of chilli, even Heinz)
Milk (calcium overload and way too many choices)
Bread (too sweet and life, from bread?)
Chocolate (lacking something, doesn't give you that mmmm feeling)
There are probably others too, but these are at the top of my list so far.
On a positive note, I love love the little milk bottles.
Once used, wash them out and take them to 7eleven, where they give you some money back.