A truly nefarious candy, Bean Boozled by Jelly Belly offers you 12 different pairs of identical looking jelly beans. One is tasty... the other vile. Fun for the whole office! I've linked to the box of 24 for $45 bucks- but if that's more than you want you can buy them singly at stupid.com

Here's the combos:
Skunk Spray or Licorice, Rotten Egg or Buttered Popcorn, Ear Wax or Cafe Latte, Booger or Juicy Pear, Baby Wipes or Coconut, Pencil Savings or top Banana,Toothpaste or Berry Blue, Vomit or Peach, Moldy Cheese or Caramel Corn, Black Pepper or Plum