Some ideas are so good they deserve to have a life outside of the pages in which they came to life. J. K. Rowling's Bertie Bott's Every Flavor Bean is one of those ideas.
So, yeah, the actual candy treat that Jelly Belly came up with is not quite as good as the "real" thing, but it's as close as we're likely to get without real magic being involved. And you can't say they haven't come up with some interesting flavors.
Of course, that was years and years ago, and I haven't had any of these since then (being a sugar-free (mostly) house tends to diminsh the opportunities for tasting vile candies). I looked over a list of current flavors, and a few really stood out:
bacon bagel, baking soda, caterpillar (How did they determine the flavor of caterpillar? Do caterpillars all taste the same or is it dependent upon what kind of butterfly they'll be? If so, what kind of caterpillar is the Bertie Bott bean?), copper, glue (every child's favorite), lucozade (because I have no idea what this is), mayonnaise, mucous, rotten egg (because smelling them isn't bad enough), sulfur (because it smells like rotten eggs, so what does it taste like?), and toe nails.
If you want to see a full list, you can go here. Well, I don't actually know if it's a full list, but it's the best list I could find.
I'll just leave you with this:
"Ah! Bertie Bott's Every Flavor Beans! I was unfortunate enough in my youth to come across a vomit-flavored one, and since then I'm afraid I've rather lost my liking for them -- but I think I'll be safe with a nice toffee, don't you?"
He smiled and popped the golden-brown bean into his mouth. Then he choked and said, "Alas! Ear wax!"