I love fire. My friends love it too. When I set them on fire, they run around and scream. They sometimes get so tired they immediately fall asleep forever. Also, they need a shower.
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Explanation
The humor comes from the dark twist: the narrator talks about setting their friends on fire as if it's a fun activity, and the 'falling asleep forever' is a euphemism for death. The shower comment is an absurd understatement.