In his famous anti-skeptical work, On Certainty, Wittgenstein wants "grounds for doubt". He wants positive reason to accept a radically skeptical hypothesis.
Trudeau obliges. The key panels:
The same reasoning might apply if things are implausibly hellish.
Such reasoning should apply especially to Wittgenstein himself. I mean, what's the prior probability of that being your life -- impoverished scion of a suicidal Austrian family of immense wealth, arguably the greatest philosopher of your day though unemployed and hardly publishing, etc.? At the time he wrote On Certainty, Wittgenstein should have thought: Surely all this is some weird dreambrain mashup of wish fulfillment and nightmare!
Philosophers at the peak of public fame should all be dream skeptics. QED.