Bertie Bott's Jelly Beans
My logic is:
1) The one time I had jelly slugs, they ended up sticking to the packaging (eww);
2) In the films, the chocolate frogs come to life - a bit offputting if it's your food.
The jelly beans include some gross flavours, like vomit - it's almost like a roulette, but I still like to eat them, as they include some unique, fun flavours, too.