Even people who are good for nothing have the capacity to bring a smile to your face, for instance when you push them down the stairs.
Stairway Smiles
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Explanation
Experiment
Explain Bear
Listen here, you smoothbrain. You really need someone to explain this? Ok, fine. Some people are useless, and the only way they make you happy is when you hurt them, like pushing them down some stairs. Now go think about it until you get it.