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After seeing a kid with Tourette's Syndrome at the toy store, Cartman becomes obsessed with it. He finds out that with Tourette's, he can say whatever he wants without consequence. Naturally, he calls Dateline so he can get on National TV and take full advantage of his new found life.
Cartman seeing a leprechaun is only the start of trouble when the boys find themselves with the entirety of the world's imagination laid out in front of them. Unfortunately, their newfound knowledge is wanted by the U.S. Government.