I have one 20 sided that dates back to my first dices. Some one stole all my dice i had back when i was in high school and this little green god was all i could find. Ever since then we have always had good luck together. So when my other dice start rolling bad i just dump out my dice bag, Remove everything and put my little greenie in there with the offending dice. I swear sometimes i hear what are muffled screams but after a min or two when i pull that dice out it starts rolling like it should. This trick has never failed me and nether has little greenie.