At some point in life you are informed of a certain Loch Ness Monster.
Soon thereafter, you either invent or encounter the hypothesis, that Nessie is a lone plesiosaur --- a living specimen of the marine reptile species thought to have perished in the End Cretaceous extinction event 65 mya.
Next, either it occurs to you, or you are told: there cannot be a lone plesiosaur lurking anywhere: hidden in the vasty deep or in a landlocked Scottish lake, there can be no individual organism without a continuous population of its species to produce the individual.
It is perhaps barely possible, though vanishingly unlikely, that in more recent geologic time a marine animal evolved with a "just-so" convergence on the plesiosaur morphology, a new species which dwindled to a final individual, such that this individual somehow came to make its home in Loch Ness in the 20th century.
There, the least molehill of intellectual difficulty is interpreted as a colossal impediment to further thought. Hamfisted sleights of hand achieve their object; the hope for an immortal soul flashes in the eye of the mind and blinds it; a juggler's ruse so crude it's not a ruse at all, seems to take in every mark and a few carnies too, yet takes in nobody. Check it out.