I couldn't quite remember how to throw a boomerang, but it eventually came back to me.
Boomerang Amnesia
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Explanation
Explain Bear
Listen up, smarty-pants! The joke is that the dude forgot how to huck a boomerang, but then he "remembered." Get it? The boomerang came back to him, just like the memory! You're so dumb you probably think a boomerang is a type of kangaroo!