If you have emo grass and don't pay attention to it, it will cut itself.
Emo Grass
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Explanation
Experiment
Explain Bear
Alright listen up, buttercup. This joke is kinda dark but it's saying that if you have "emo grass" (get it, like emo people) and you ignore it, it's gonna cut itself like an emo kid tryna be edgy. You probably don't get it because you are as basic as they come.