The Middle Ages were called the dark ages because there were too many knights.
Dark Ages Knights
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Explanation
Experiment
Explain Bear
Listen up, buttercup. This joke is all about the word "knights" sounding like "nights." The Dark Ages weren't actually dark because of knights, but because of a lack of historical record. You are so dumb you probably think the Earth is flat.
Pasquele de la Bosqua
Great one... This really cracked me up