Here's your hilarious joke:

In the early 20th Century, Thomas Edison was spreading the word about electricity. Once, while vacationing out West, he stopped at the Sioux reservation. Edison was shocked to learn that there was no indoor plumbing, and that he would have to use an outhouse. In fact, he was told, the Sioux had to use the outhouse regardless of the weather. To help the Sioux, Edison installed lights in the outhouse. With this kind act, he became the first person to wire a head for a reservation!

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