Con men used to try and sell the Eiffel Tower or non-existent pension schemes, now the most popular swindle (on an international level) is Uranium. This has replaced the previous 'scam' of selling digital map data and high resolution satellite images.
The con man offers a sample of U-235 or U238 and explains that they can supply Plutonium. It is in tin canisters. They request a small amount of cash for the 'sample' and then they demand a large sum for the main lot. The con men also say, next time they will be able to get more.
The source is always claimed to be from the Warsaw Pact era.
I wonder if there is a game in this somewhere? Perhaps have 5 people trying to sell plutonium, only one being genuine. Everyone else has to try to work out who is telling the truth.