Knowledge is power, people. Purge these maggots of sloppy thinking from you own brains and learn to identify them.
THE UNFALSIFIABLE HYPOTHESIS/SPECIAL PLEADING
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We've all tried debating somebody with an unfalsifiable hypothesis, and we all know how futile it is. An unfalsifiable hypothesis is exactly what it sounds like, a theory that cannot be disproved. The simplest example is solipsism, the philosophical notion that the only thing that really exists is you and that everything you perceive and experience is a figment of your own imagination. There's simply no logical way to argue against this notion. Like the slippery slope, it might be true (yeah, you might be the only person in existence, and you're only reading this because you've made the whole thing up in your sick, twisted mind), but it's still a faulty argument. Note, though, that some unfalsifiable hypotheses, though they can't be disproved, can still be proved. If aliens landed on the front lawn of the White House, for instance, that would pretty definitively prove they exist, even though there is no way to disprove the existence of aliens today.