Buying Uranium off Amazon
Testing a geiger counter? Elaborate practical joke? A throw at super powers?
For about $30, get your own bucket of Uranium Ore off Amazon. Make sure to have a look at the downright hilarious customer reviews:
I got this for the kids and they have a great time throwing it at each other and the pets. They put it in the pool and now I have to deal with some angry things from the center of the earth. Oh well the kids did have fun.