I'm a Brit who loves Reese's Peanut Butter Cups. And they are not always easy to buy in this country (I know I could order off the internet, but it would have to be in bulk and both my impulse control is sometimes a bit faulty, and when you add P & P it gets awfully expensive for a candy bar).
Or, I suppose, anything sour enough that your cheeks pull in tight. Although I am still looking for something really sour enough.
Worst - anything chewy/gummy with mineral oil on it. Yick. What the fuck? Why!
Even the thought of it makes me gag.