In logic and philosophy, a formal fallacy is a pattern of reasoning rendered invalid by a flaw in its logical structure that can neatly be expressed in a standard logic system, for example propositional logic. It is defined as a 展开

"Some of your key evidence is missing, incomplete, or even faked! That proves I'm right!"
"The vet can't find any … 展开

• Philosophy portal
• Psychology portal
• List of fallacies – List of faulty argument types
• Apophasis – Stating something by saying the opposite
• Cognitive bias – … 展开

In everyday speech, a non sequitur is a statement in which the final part is totally unrelated to the first part, for example:
Life is life and fun is fun, but it's all so quiet when the goldfish die.— … 展开