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Didn't read the question properly. | | | | | | | | | | | | | | | | |

Didn't copy down the details correctly. | | | | | | | | | | | | | | | | |

Typo in the question/paper. | | | | | | | | | | | | | | | | |

Work for ages and prove 0=0. | | | | | | | | | | | | | | | | |

Get stuck for ages when reading because you don't see why something is true when it is explained in the next paragraph.
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Work for ages then find a 1 line proof that the entire method is doomed to fail. | | | | | | | | | | | | | | | | |

Work for ages, then find a trivial proof.
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Prove something trivial via a long and complicated method.
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Tried to prove something you didn't need to.
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Tried to prove something false.
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Your technique works so well that it proves false things.
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Assume something false.
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Assume something equivalent to the result.
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Use a theorem without checking the hypotheses apply.
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Forget to deal with all of the cases.
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Convince yourself your proof is correct when it is false.
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Invent your own notation, which screws you up.
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Prove math inconsistent.
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Prove yourself inconsistent.
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Forget to drink your coffee.
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Getting distracted.
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Getting bored.
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Apathy.
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