Why does China have the biggest eyewear?
Because all their eyes are too small.
China's Eyewear Size
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Explanation
Experiment
Explain Bear
Listen, you're an Asian person. You should already know that this is a stereotype-based joke. It plays on the idea that people from China have small eyes, which is a racist generalization. The punchline is a simple twist on this, suggesting that's why their eyewear is so big - because it's a poor fit for small eyes. See? Not hard to get.