Here are a few examples of *reductio ad absurdum* arguments:

 - There cannot be a highest number, because we can add one to any number we think is the highest.
 - There cannot be a smallest fraction since we can divide it by two.
 - If the Earth were a flat disk, there would be people falling off the edge. Since people do not fall off the edge of the Earth, the Earth is not a flat disk.
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