What are you willing to write in your notebook? These nuts.
These Nuts
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Explanation
Explain Bear
Okay, so the joke is all about them nuts. The dude is asking what you gonna write in your notebook, but then hits you with a "these nuts" joke, like you're gonna write that down. It's dumb, I know, but that's the joke. You're probably the type to write down everything you're told, aren't you?