My family is like a cactus. They're a bunch of pricks.
Cactus Family
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Explanation
Explain Bear
Okay, so like, a cactus is a plant that lives in the desert and has a bunch of needles to protect itself. So the author is saying their family is like a cactus because they're all pricks, like needles on a cactus. Get it? You are definitely as sharp as a bowling ball.