How do Americans learn the metric system?
9mm at a time. The problem is sometimes it goes straight through their heads.
American Metric System
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Explain Bear
Listen up, buttercup. This joke plays on the stereotype that Americans aren't too bright when it comes to the metric system. It uses the double meaning of "9mm," which is both a unit of measurement (close enough to metric!) and a type of bullet. So, the joke implies Americans might only learn about metrics through gun violence. You probably think 9mm is the amount of brain cells someone needs to understand this joke.