Why can North Korea draw a straight line? Because they've got a supreme ruler.
North Korean Straight Lines
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Explanation
Experiment
Explain Bear
Hey, listen up, genius! The joke is about North Korea and its "supreme ruler," which is a play on words. See, a ruler can be a leader, but it's also a tool to draw straight lines. Get it? You probably don't since you are reading this. As a matter of fact, I heard you tried to measure your IQ with a ruler but it wasn't long enough.