What is the CRAZIEST thing in the English language that you have problems remembering?

What is the CRAZIEST thing in the English language that you have problems remembering?

Let's face it, English is a crazy language. Much of it is stolen or borrowed from other languages, making it inconsistent and practically impossible to speak it 100% correctly. Yet it's the most common language spoken by people in the world, most as a second language, not their native language.

I can never remember how and why the plural of INDEX is INDICES, though I guess INDEXES is sometimes acceptable.

What is the craziest thing in the English language that you have problems remembering?

What is the CRAZIEST thing in the English language that you have problems remembering?
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